EXHIBIT 99.1
 
- --------------------------------
                            USX
- --------------------------------


            Index to Consolidated Financial Statements, Supplementary
            Data, Management's Discussion and Analysis and Quantitative and 
            Qualitative Disclosures About Market Risk
 
 
                                                                           Page
                                                                               
                                                                           ----
            Management's Report..........................................  U-1 
                                                                               
            Audited Consolidated Financial Statements:                         
                                                                               
              Report of Independent Accountants..........................  U-1 
                                                                               
              Consolidated Statement of Operations.......................  U-2 
                                                                               
              Consolidated Balance Sheet.................................  U-4 
                                                                               
              Consolidated Statement of Cash Flows.......................  U-5 
                                                                               
              Consolidated Statement of Stockholders' Equity.............  U-6 
                                                                               
              Notes to Consolidated Financial Statements.................  U-8 
                                                                               
            Selected Quarterly Financial Data............................  U-29
                                                                               
            Principal Unconsolidated Affiliates..........................  U-30
                                                                               
            Supplementary Information....................................  U-30
                                                                               
            Five-Year Operating Summary -- Marathon Group................  U-35
                                                                               
            Five-Year Operating Summary -- U. S. Steel Group.............  U-37
                                                                               
            Five-Year Financial Summary..................................  U-38
                                                                               
            Management's Discussion and Analysis.........................  U-39
                                                                               
            Quantitative and Qualitative Disclosures About Market Risk...  U-55

 
             Management's Report

             The accompanying consolidated financial statements of USX
             Corporation and Subsidiary Companies (USX) are the responsibility
             of and have been prepared by USX in conformity with generally
             accepted accounting principles. They necessarily include some
             amounts that are based on best judgments and estimates. The
             consolidated financial information displayed in other sections of
             this report is consistent with these consolidated financial
             statements.

                USX seeks to assure the objectivity and integrity of its
             financial records by careful selection of its managers, by
             organizational arrangements that provide an appropriate division of
             responsibility and by communications programs aimed at assuring
             that its policies and methods are understood throughout the
             organization.

                USX has a comprehensive formalized system of internal accounting
             controls designed to provide reasonable assurance that assets are
             safeguarded and that financial records are reliable. Appropriate
             management monitors the system for compliance, and the internal
             auditors independently measure its effectiveness and recommend
             possible improvements thereto. In addition, as part of their audit
             of the consolidated financial statements, USX's independent
             accountants, who are elected by the stockholders, review and test
             the internal accounting controls selectively to establish a basis
             of reliance thereon in determining the nature, extent and timing of
             audit tests to be applied.

                The Board of Directors pursues its oversight role in the
             area of financial reporting and internal accounting control through
             its Audit Committee. This Committee, composed solely of
             nonmanagement directors, regularly meets (jointly and separately)
             with the independent accountants, management and internal auditors
             to monitor the proper discharge by each of its responsibilities
             relative to internal accounting controls and the consolidated
             financial statements.



                                                                     
             Thomas J. Usher                 Robert M. Hernandez          Kenneth L. Matheny
             Chairman, Board of Directors    Vice Chairman                Vice President
             & Chief Executive Officer       & Chief Financial Officer    & Comptroller


             Report of Independent Accountants

             To the Stockholders of USX Corporation:

             In our opinion, the accompanying consolidated financial statements
             appearing on pages U-2 through U-28 present fairly, in all material
             respects, the financial position of USX Corporation and its
             subsidiaries at December 31, 1997 and 1996, and the results of
             their operations and their cash flows for each of the three years
             in the period ended December 31, 1997 in conformity with generally
             accepted accounting principles. These financial statements are the
             responsibility of USX's management; our responsibility is to
             express an opinion on these financial statements based on our
             audits. We conducted our audits of these statements in accordance
             with generally accepted auditing standards which require that we
             plan and perform the audit to obtain reasonable assurance about
             whether the financial statements are free of material misstatement.
             An audit includes examining, on a test basis, evidence supporting
             the amounts and disclosures in the financial statements, assessing
             the accounting principles used and significant estimates made by
             management, and evaluating the overall financial statement
             presentation. We believe that our audits provide a reasonable basis
             for the opinion expressed above.

                As discussed in Note 5, page U-11, in 1995 USX adopted a new
             accounting standard for the impairment of long-lived assets.

             Price Waterhouse LLP
             600 Grant Street, Pittsburgh, Pennsylvania 15219-2794
             February 10, 1998

                                                                             U-1

 
                Consolidated Statement of Operations



                (Dollars in millions)                                                     1997      1996      1995
                -----------------------------------------------------------------------------------------------------
                                                                                                     
                REVENUES:                                  
                 Sales (Note 4)                                                           $22,375   $22,743   $20,273
                 Dividend and affiliate income                                                105        99       100
                 Gain on disposal of assets                                                    94        71        29
                 Gain on affiliate stock offering (Note 8)                                      -        53         -
                 Other income                                                                  14        11        11
                                                                                          -------   -------   -------
                       Total revenues                                                      22,588    22,977    20,413
                                                                                          -------   -------   ------- 
                COSTS AND EXPENSES:                                     
                 Cost of sales (excludes items shown below)                                16,047    16,930    14,522      
                 Selling, general and administrative expenses                                 218       144       163 
                 Depreciation, depletion and amortization                                     967       985     1,135 
                 Taxes other than income taxes                                              3,178     3,202     3,113 
                 Exploration expenses                                                         189       146       149 
                 Inventory market valuation charges (credits) (Note 19)                       284      (209)      (70)
                 Impairment of long-lived assets (Note 5)                                       -         -       675 
                                                                                           ------   -------   ------- 
                       Total costs and expenses                                            20,883    21,198    19,687 
                                                                                           ------   -------   -------  
                INCOME FROM OPERATIONS                                                      1,705     1,779       726  
                Net interest and other financial costs (Note 6)                               347       421       466  
                                                                                           ------   -------   -------
                INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES                       1,358     1,358       260  
                Provision for estimated income taxes (Note 12)                                450       412        43  
                                                                                           ------   -------   -------
                INCOME FROM CONTINUING OPERATIONS                                             908       946       217
                                                                                           ------   -------   -------  
                DISCONTINUED OPERATIONS (Note 3):                 
                 Income (loss) from operations (net of income tax)                             (1)        6         4  
                 Gain on disposal (net of income tax)                                          81         -         - 
                                                                                           ------   -------   -------   
                INCOME FROM DISCONTINUED OPERATIONS                                            80         6         4 
                                                                                           ------   -------   -------   
                Extraordinary loss (Note 7)                                                     -         9         7 
                                                                                           ------   -------   -------  
                NET INCOME                                                                    988       943       214    
                Noncash credit from exchange of preferred stock (Note 26)                      10         -         -    
                Dividends on preferred stock                                                  (13)      (22)      (28)   
                                                                                          -------   -------   -------    
                NET INCOME APPLICABLE TO COMMON STOCKS                                    $   985   $   921   $   186     
                -----------------------------------------------------------------------------------------------------        


                The accompanying notes are an integral part of these
                consolidated financial statements.

U-2

 
                Income Per Common Share

 
 
                (Dollars in millions, except per share data)     1997   1996    1995
                ---------------------------------------------------------------------- 
                                                                        
                CONTINUING OPERATIONS
                APPLICABLE TO MARATHON STOCK:
                  Income (loss) before extraordinary loss        $ 456  $ 671   $ (87)
                  Extraordinary loss                                 -     (7)     (5)
                                                                 -----  -----   ------
                  Net income (loss)                              $ 456  $ 664   $ (92)
                  PER SHARE DATA
                   BASIC:
                    Income (loss) before extraordinary loss      $1.59  $2.33   $(.31)
                    Extraordinary loss                               -   (.02)   (.02)
                                                                 -----  -----   ------
                    Net income (loss)                            $1.59  $2.31   $(.33)
                  DILUTED:
                    Income (loss) before extraordinary loss      $1.58  $2.31   $(.31)
                    Extraordinary loss                               -   (.02)   (.02)
                                                                 -----  -----   ------
                    Net income (loss)                            $1.58  $2.29   $(.33)
                ----------------------------------------------------------------------
                APPLICABLE TO STEEL STOCK:
                 Income before extraordinary loss                $ 449  $ 253   $ 279
                 Extraordinary loss                                  -     (2)     (2)
                                                                 -----  -----   ------
                 Net income                                      $ 449  $ 251   $ 277
                 PER SHARE DATA
                  BASIC:
                   Income before extraordinary loss              $5.24  $3.00   $3.53
                   Extraordinary loss                                -   (.02)   (.02)
                                                                 -----  -----   ------
                   Net income                                    $5.24  $2.98   $3.51
                  DILUTED:
                   Income before extraordinary loss              $4.88  $2.97   $3.43
                   Extraordinary loss                                -   (.02)   (.02)
                                                                 -----  -----   ------
                   Net income                                    $4.88  $2.95   $3.41
                ----------------------------------------------------------------------
                DISCONTINUED OPERATIONS
                APPLICABLE TO OUTSTANDING DELHI STOCK:
                 Income before extraordinary loss                $79.7  $ 6.4   $ 1.4
                 Extraordinary loss                                  -    (.5)    (.3)
                                                                 -----  -----   ------
                 Net income                                      $79.7  $ 5.9   $ 1.1
                 PER SHARE DATA
                  BASIC:
                   Income before extraordinary loss              $8.43  $ .67   $ .15
                   Extraordinary loss                                -   (.06)   (.03)
                                                                 -----  -----   ------
                   Net income                                    $8.43  $ .61   $ .12
                  DILUTED:
                   Income before extraordinary loss              $8.41  $ .67   $ .15
                   Extraordinary loss                                -   (.06)   (.03)
                                                                 -----  -----   ------
                   Net income                                    $8.41  $ .61   $ .12
                ----------------------------------------------------------------------


                See Note 24, for a description and computation of income per
                common share.
                The accompanying notes are an integral part of these
                consolidated financial statements.

                                                                             U-3

 
             Consolidated Balance Sheet

 
 
             (Dollars in millions)                                                   December 31       1997    1996
             --------------------------------------------------------------------------------------------------------
                                                                                                      
             ASSETS
             Current assets:
               Cash and cash equivalents                                                            $    54   $    55
               Receivables, less allowance for doubtful accounts of
                $15 and $26 (Note 13)                                                                 1,417     1,270
               Inventories (Note 19)                                                                  1,685     1,939
               Deferred income tax benefits (Note 12)                                                   229        57
               Other current assets                                                                      87        81
                                                                                                    -------   -------
                  Total current assets                                                                3,472     3,402

             Investments and long-term receivables, less reserves
               of $15 and $17 (Note 14)                                                               1,028       854
             Property, plant and equipment - net (Note 17)                                           10,062    10,404
             Prepaid pensions (Note 10)                                                               2,247     2,014
             Other noncurrent assets                                                                    280       306
             Cash restricted for redemption of Delhi Stock (Note 3)                                     195         -
                                                                                                    -------   -------
                  Total assets                                                                      $17,284   $16,980
             --------------------------------------------------------------------------------------------------------
             LIABILITIES
             Current liabilities:
               Notes payable                                                                        $   121   $    81
               Accounts payable                                                                       2,011     2,204
               Payroll and benefits payable                                                             521       475
               Accrued taxes                                                                            304       304
               Accrued interest                                                                          95       102
               Long-term debt due within one year (Note 16)                                             471       353
                                                                                                    -------   -------
                  Total current liabilities                                                           3,523     3,519
             Long-term debt (Note 16)                                                                 2,932     3,859
             Long-term deferred income taxes (Note 12)                                                1,353     1,097
             Employee benefits (Note 11)                                                              2,713     2,797
             Deferred credits and other liabilities                                                     736       436
 
             Preferred stock of subsidiary (Note 25)                                                    250       250
             USX obligated mandatorily redeemable convertible preferred
              securities of a subsidiary trust holding solely junior subordinated
              convertible debentures of USX (Note 26)                                                   182         -
             Redeemable Delhi Stock (Note 3)                                                            195         -
 
             STOCKHOLDERS' EQUITY (Details on pages U-6 and U-7)
             Preferred stock (Note 27)-
               6.50% Cumulative Convertible issued - 2,962,037 shares and
                6,900,000 shares ($148 and $345 liquidation preference, respectively)                     3         7
             Common stocks:
               Marathon Stock issued - 288,786,343 shares and 287,525,213 shares
                (par value $1 per share, authorized 550,000,000 shares)                                 289       288
               Steel Stock issued - 86,577,799 shares and 84,885,473 shares
                (par value $1 per share, authorized 200,000,000 shares)                                  86        85
               Delhi Stock issued - 9,448,269 shares
                (par value $1 per share, authorized 50,000,000 shares) (Note 3)                           -         9
             Additional paid-in capital                                                               3,924     4,150
             Retained earnings                                                                        1,138       517
             Other equity adjustments                                                                   (40)      (34)
                                                                                                    -------   -------
                  Total stockholders' equity                                                          5,400     5,022
                                                                                                    -------   -------
                  Total liabilities and stockholders' equity                                        $17,284   $16,980
             --------------------------------------------------------------------------------------------------------


             The accompanying notes are an integral part of these consolidated
             financial statements.

U-4

 
Consolidated Statement of Cash Flows




(Dollars in millions)                                                  1997      1996      1995
- -------------------------------------------------------------------------------------------------
                                                                                 
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS                    
                                                                    
OPERATING ACTIVITIES:                                               
                                                                    
Net income                                                            $   988   $   943   $   214
Adjustments to reconcile to net cash provided                       
 from operating activities:                                         
  Extraordinary loss                                                        -         9         7
  Depreciation, depletion and amortization                                987     1,012     1,160
  Exploratory dry well costs                                               78        54        64
  Inventory market valuation charges (credits)                            284      (209)      (70)
  Pensions                                                               (225)     (187)     (338)
  Postretirement benefits other than pensions                            (117)       36        12
  Deferred income taxes                                                   228       257       (68)
  Gain on disposal of the Delhi Companies                                (287)        -         -
  Gain on disposal of assets                                              (94)      (71)      (30)
  Gain on affiliate stock offering                                          -       (53)        -
  Payment of amortized discount on zero coupon debentures                 (17)        -      (129)
  Impairment of long-lived assets                                           -         -       675
  Changes in: Current receivables - sold                                 (390)        -       (10)
                                  - operating turnover                     16      (170)      (74)
          Inventories                                                     (39)       27        40
          Current accounts payable and accrued expenses                    91        83       195
  All other - net                                                         (45)      (82)      (16)
                                                                      -------   -------   -------
   Net cash provided from operating activities                          1,458     1,649     1,632
                                                                      -------   -------   -------
INVESTING ACTIVITIES:                                               
                                                                    
Capital expenditures                                                   (1,373)   (1,168)   (1,016)
Proceeds from sale of the Delhi Companies                                 752         -         -
Disposal of assets                                                        481       443       157
Withdrawal (deposit) - property exchange trusts                            98       (98)        -
Investments in equity affiliates - net                                   (249)       (2)        3
Cash restricted for redemption of Delhi Stock                            (195)        -         -
All other - net                                                            (3)       26         1
                                                                      -------   -------   -------
   Net cash used in investing activities                                 (489)     (799)     (855)
                                                                      -------   -------   -------
FINANCING ACTIVITIES:                                               
Commercial paper and revolving credit arrangements  net                    41      (153)     (117)
Other debt - borrowings                                                    11       191        52
           - repayments                                                  (786)     (711)     (446)
Preferred stock redeemed                                                    -         -      (105)
Common stock - issued                                                      82        53       218
             - repurchased                                                  -         -        (1)
Dividends paid                                                           (316)     (307)     (295)
                                                                      -------   -------   -------
   Net cash used in financing activities                                 (968)     (927)     (694)
                                                                      -------   -------   -------
EFFECT OF EXCHANGE RATE CHANGES ON CASH                                    (2)        1         -
                                                                      -------   -------   -------
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS                       (1)      (76)       83
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR                             55       131        48
                                                                      -------   -------   -------
CASH AND CASH EQUIVALENTS AT END OF YEAR                              $    54   $    55   $   131
- -------------------------------------------------------------------------------------------------


See Note 20, for supplemental cash flow information.
The accompanying notes are an integral part of these consolidated financial 
statements.

                                                                             U-5

 
             Consolidated Statement of Stockholders' Equity

             After the redemption of the USX Delhi Common Stock (Delhi Stock) on
             January 26, 1998 (Note 3), USX has two classes of common stock: USX
             Marathon Group Common Stock (Marathon Stock) and USX U. S. Steel
             Group Common Stock (Steel Stock), which are intended to reflect the
             performance of the Marathon Group and the U. S. Steel Group,
             respectively. (See Note 9, for a description of the two Groups.)

                On all matters where the holders of Marathon Stock and
             Steel Stock vote together as a single class, Marathon Stock has one
             vote per share and Steel Stock has a fluctuating vote per share
             based on the relative market value of a share of Steel Stock to the
             market value of a share of Marathon Stock. In the event of a
             disposition of all or substantially all the properties and assets
             of the U. S. Steel Group, USX must either distribute the net
             proceeds to the holders of the Steel Stock as a special dividend or
             in redemption of the stock, or exchange the Steel Stock for the
             Marathon Stock. In the event of liquidation of USX, the holders of
             the Marathon Stock and Steel Stock will share in the funds
             remaining for common stockholders based on the relative market
             capitalization of the respective Marathon Stock and Steel Stock to
             the aggregate market capitalization of both classes of common
             stock.



                                                                    Shares in thousands                 Dollars in millions
                                                            -----------------------------------   --------------------------------
                                                               1997         1996        1995         1997        1996       1995
             --------------------------------------------------------------------------------------------------------------------- 
                                                                                                        
             PREFERRED STOCKS (Note 27):
              Adjustable Rate Cumulative:
               Outstanding at beginning of year                      -            -       2,100   $       -   $       -  $     105
               Redeemed                                              -            -      (2,100)          -           -       (105)
                                                            ----------   ----------  ----------   ---------   ---------- ---------  

               Outstanding at end of year                            -            -           -   $       -   $        - $       -
             ---------------------------------------------------------------------------------------------------------------------
              6.50% Cumulative Convertible:
               Outstanding at beginning of year                  6,900        6,900       6,900   $       7   $       7  $       7
               Shares exchanged for trust                                         
                preferred securities                            (3,938)           -           -          (4)          -          -
                                                            ----------   ----------  ----------   ---------   ---------- ---------  

               Outstanding at end of year                        2,962        6,900       6,900   $       3   $       7  $       7
             ---------------------------------------------------------------------------------------------------------------------
             COMMON STOCKS:
              Marathon Stock:
               Outstanding at beginning of year                287,525      287,398     287,186       $ 288       $ 287      $ 287
               Issued for employee stock plans                   1,261          127         212           1           1          -
                                                            ----------   ----------  ----------   ---------   ---------  --------- 
               Outstanding at end of year                      288,786      287,525     287,398       $ 289       $ 288      $ 287
             --------------------------------------------------------------------------------------------------------------------- 
              Steel Stock:
               Outstanding at beginning of year                 84,885       83,042      75,970   $      85   $      83  $      76
               Issued in public offering                             -            -       5,000           -           -          5
               Issued for:                      
                Employee stock plans                             1,416        1,649       1,681           1           2          2
                Dividend Reinvestment Plan                         277          194         391           -           -          -
                                                            ----------   ----------  ----------   ---------   ---------  --------- 
               Outstanding at end of year                       86,578       84,885      83,042   $      86   $      85  $      83
             --------------------------------------------------------------------------------------------------------------------- 
              Delhi Stock:
               Outstanding at beginning of year                  9,448        9,447       9,438   $       9   $       9  $       9
               Issued (canceled) for employee stock plans           (3)           1           9           -           -          -
               Reclassified to redeemable Delhi Stock           (9,445)           -           -          (9)          -          -
                                                            ----------   ----------  ----------   ---------   ---------  --------- 
               Outstanding at end of year                            -        9,448       9,447   $       -   $       9  $       9
             --------------------------------------------------------------------------------------------------------------------- 

                        (Table continued on next page)

U-6

 


                                                    Shares in thousands                  Dollars in millions
                                             ---------------------------------    ----------------------------------
                                                1997         1996        1995        1997        1996        1995
- --------------------------------------------------------------------------------------------------------------------
                                                                                          
 TREASURY COMMON STOCKS, AT COST:
  Marathon Stock:
   Balance at beginning of year                      -            -           -   $       -    $       -   $       - 
   Repurchased                                     (14)          (7)        (40)          -            -          (1)
   Reissued for employee stock plans                14            7          40           -            -           1 
                                             ---------    ---------   ---------   ---------    ---------   --------- 
   Balance at end of year                            -            -           -   $       -    $       -   $       - 
- --------------------------------------------------------------------------------------------------------------------   
  Steel Stock:
   Balance at beginning of year                      -            -           -   $       -    $       -   $       -
   Repurchased                                     (11)          (7)        (15)          -            -           -
   Reissued for employee stock plans                11            7          15           -            -           -
                                             ---------    ---------   ---------   ---------    ---------   ---------     
   Balance at end of year                            -            -           -   $       -    $       -   $       -
- --------------------------------------------------------------------------------------------------------------------     
  Delhi Stock:
   Balance at beginning of year                      -            -           -   $       -    $       -   $       -
   Repurchased                                      (1)          (1)         (2)          -            -           -
   Reissued for employee stock plans                 1            1           2           -            -           -
                                             ---------    ---------   ---------   ---------    ---------   --------- 
   Balance at end of year                            -            -           -   $       -    $       -   $       -
- --------------------------------------------------------------------------------------------------------------------  
 ADDITIONAL PAID-IN CAPITAL:
   Balance at beginning of year                                                   $   4,150    $   4,094   $   4,168 
   Marathon Stock issued                                                                 38            3           4 
   Steel Stock issued                                                                    52           53         227 
   6.50% preferred stock exchanged for                                                                               
    trust preferred securities                                                         (188)           -           - 
   Reclassified to redeemable Delhi Stock                                              (128)           -           - 
   Dividends on preferred stock                                                           -            -         (28)
   Dividends on Marathon Stock (per share $.68)                                           -            -        (195)
   Dividends on Steel Stock  (per share $1.00)                                            -            -         (80)
   Dividends on Delhi Stock (per share $.20)                                              -            -          (2) 
                                                                                  ---------    ---------   ---------   
   Balance at end of year                                                         $   3,924    $   4,150   $   4,094  
- --------------------------------------------------------------------------------------------------------------------
 RETAINED EARNINGS (DEFICIT):
   Balance at beginning of year                                                   $     517    $    (116)  $    (330)
   Net income                                                                           988          943         214
   Dividends on preferred stock                                                         (13)         (22)          -
   Dividends on Marathon Stock (per share: $.76 in 1997                                                 
    and $.70 in 1996)                                                                  (219)        (201)          -
   Dividends on Steel Stock  (per share $1.00)                                          (86)         (85)          -
   Dividends on Delhi Stock (per share: $.15 in 1997 and                                                
    $.20 in 1996)                                                                        (1)          (2)          -
   Reclassified to redeemable Delhi Stock                                               (58)           -           -
   Noncash credit from exchange of preferred stock                                       10            -           -
                                                                                  ---------    ---------   ---------   
   Balance at end of year                                                         $   1,138    $     517   $    (116)
- ---------------------------------------------------------------------------------------------------------------------    
 OTHER EQUITY ADJUSTMENTS:
   Foreign currency translation                                                   $      (8)   $      (8)  $      (8)
   Deferred compensation (Note 21)                                                       (3)          (4)         (5)
   Minimum pension liability (Note 10)                                                  (32)         (22)        (23)
   Unrealized holding gains on investments                                                3            -           -
                                                                                  ---------    ---------   ---------   
   Total other equity adjustments                                                 $     (40)   $     (34)  $     (36)
- --------------------------------------------------------------------------------------------------------------------     
 TOTAL STOCKHOLDERS' EQUITY                                                       $   5,400    $   5,022   $   4,328
- --------------------------------------------------------------------------------------------------------------------


The accompanying notes are an integral part of these consolidated financial 
statements.

                                                                             U-7

 
             Notes to Consolidated Financial Statements

1. SUMMARY OF PRINCIPAL ACCOUNTING POLICIES

             PRINCIPLES APPLIED IN CONSOLIDATION - The consolidated financial
             statements include the accounts of USX Corporation and its
             majority-owned subsidiaries (USX).

                 Investments in unincorporated oil and gas joint ventures,
             undivided interest pipelines and jointly-owned gas processing
             plants are consolidated on a pro rata basis.

                 Investments in other entities over which USX has significant
             influence are accounted for using the equity method of accounting
             and are carried at USX's share of net assets plus advances. The
             proportionate share of income from these equity method investments
             is included in revenues.

                 Investments in other companies whose stock is publicly traded
             are carried at market value. The difference between the cost of
             these investments and market value is recorded as a direct
             adjustment to stockholders' equity (net of tax). Investments in
             companies whose stock has no readily determinable fair value are
             carried at cost. Dividends from these investments are recognized in
             revenues.

                 Gains or losses from a change in ownership interest of a
             consolidated subsidiary or an unconsolidated affiliate are
             recognized in revenues in the period of change.

             USE OF ESTIMATES - Generally accepted accounting principles require
             management to make estimates and assumptions that affect the
             reported amounts of assets and liabilities, the disclosure of
             contingent assets and liabilities at year-end and the reported
             amounts of revenues and expenses during the year.

             CASH AND CASH EQUIVALENTS - Cash and cash equivalents include cash
             on hand and on deposit and highly liquid debt instruments with
             maturities generally of three months or less.

             INVENTORIES - Inventories are carried at lower of cost or market.
             Cost of inventories is determined primarily under the last-in,
             first-out (LIFO) method.

             DERIVATIVE INSTRUMENTS - USX engages in commodity and currency risk
             management activities within the normal course of its businesses as
             an end-user of derivative instruments (Note 28). Management is
             authorized to manage exposure to price fluctuations related to the
             purchase, production or sale of crude oil, natural gas, refined
             products, nonferrous metals and electricity through the use of a
             variety of derivative financial and nonfinancial instruments.
             Derivative financial instruments require settlement in cash and
             include such instruments as over-the-counter (OTC) commodity swap
             agreements and OTC commodity options. Derivative nonfinancial
             instruments require or permit settlement by delivery of commodities
             and include exchange-traded commodity futures contracts and
             options. At times, derivative positions are closed, prior to
             maturity, simultaneous with the underlying physical transaction and
             the effects are recognized in income accordingly. USX's practice
             does not permit derivative positions to remain open if the
             underlying physical market risk has been removed. Derivative
             instruments relating to fixed price sales of equity production are
             marked-to-market in the current period and the related income
             effects are included within income from operations. All other
             changes in the market value of derivative instruments are deferred,
             including both closed and open positions, and are subsequently
             recognized in income, as sales or cost of sales, in the same period
             as the underlying transaction. Premiums on all commodity-based
             option contracts are initially recorded based on the amount paid or
             received; the options' market value is subsequently recorded as a
             receivable or payable, as appropriate. The margin receivable
             accounts required for open commodity contracts reflect changes in
             the market prices of the underlying commodity and are settled on a
             daily basis.

                 Forward currency contracts are used to manage currency risks
             related to anticipated revenues and operating costs, firm
             commitments for capital expenditures and existing assets or
             liabilities denominated in a foreign currency. Gains or losses
             related to firm commitments are deferred and included with the
             underlying transaction; all other gains or losses are recognized in
             income in the current period as sales, cost of sales, interest
             income or expense, or other income, as appropriate. Net contract
             values are included in receivables or payables, as appropriate.

                 Recorded deferred gains or losses are reflected within other
             noncurrent assets or deferred credits and other liabilities. Cash
             flows from the use of derivative instruments are reported in the
             same category as the hedged item in the statement of cash flows.

             EXPLORATION AND DEVELOPMENT - USX follows the successful efforts
             method of accounting for oil and gas exploration and development.

U-8

 
             GAS BALANCING - USX follows the sales method of accounting for gas
             production imbalances.

             LONG-LIVED ASSETS - Except for oil and gas producing properties,
             depreciation is generally computed on the straight-line method
             based upon estimated lives of assets. USX's method of computing
             depreciation for steel producing assets modifies straight-line
             depreciation based on the level of production. The modification
             factors range from a minimum of 85% at a production level below 81%
             of capability, to a maximum of 105% for a 100% production level. No
             modification is made at the 95% production level, considered the
             normal long-range level.

                 Depreciation and depletion of oil and gas producing properties
             are computed using predetermined rates based upon estimated proved
             oil and gas reserves applied on a units-of-production method.

                 Depletion of mineral properties, other than oil and gas, is
             based on rates which are expected to amortize cost over the
             estimated tonnage of minerals to be removed.

                 When an entire property, plant, major facility or facilities
             depreciated on an individual basis are sold or otherwise disposed
             of, any gain or loss is reflected in income. Proceeds from disposal
             of other facilities depreciated on a group basis are credited to
             the depreciation reserve with no immediate effect on income.

                 USX evaluates impairment of its oil and gas assets primarily on
             a field-by-field basis. Other assets are evaluated on an individual
             asset basis or by logical groupings of assets. Assets deemed to be
             impaired are written down to their fair value, including any
             related goodwill, using discounted future cash flows and, if
             available, comparable market values.

             ENVIRONMENTAL LIABILITIES - USX provides for remediation costs and
             penalties when the responsibility to remediate is probable and the
             amount of associated costs is reasonably determinable. Generally,
             the timing of remediation accruals coincides with completion of a
             feasibility study or the commitment to a formal plan of action.
             Remediation liabilities are accrued based on estimates of known
             environmental exposure and could be discounted in certain
             instances. If recoveries of remediation costs from third parties
             are probable, a receivable is recorded. Estimated abandonment and
             dismantlement costs of offshore production platforms are accrued
             based on production of estimated proved oil and gas reserves.

             POSTEMPLOYMENT BENEFITS - USX recognizes an obligation to provide
             postemployment benefits, primarily for disability-related claims
             covering indemnity and medical payments. The obligation for these
             claims and the related periodic costs are measured using actuarial
             techniques and assumptions, including an appropriate discount rate,
             analogous to the required methodology for measuring pension and
             other postretirement benefit obligations. Actuarial gains and
             losses are deferred and amortized over future periods.

             INSURANCE - USX is insured for catastrophic casualty and certain
             property and business interruption exposures, as well as those
             risks required to be insured by law or contract. Costs resulting
             from noninsured losses are charged against income upon occurrence.

             RECLASSIFICATIONS - Certain reclassifications of prior years' data
             have been made to conform to 1997 classifications and to reflect
             the discontinued operations presentation from the 1997 sale of the
             Delhi Companies. See Note 3.

________________________________________________________________________________
2. NEW ACCOUNTING STANDARDS

             The following accounting standards were adopted by USX:

                 Environmental remediation liabilities - Effective January 1,
                 1997, USX adopted American Institute of Certified Public
                 Accountants Statement of Position No. 96-1, "Environmental
                 Remediation Liabilities" (SOP 96-1), which provides additional
                 interpretation of existing accounting standards related to
                 recognition, measurement and disclosure of environmental
                 remediation liabilities. As a result of adopting SOP 96-1, USX
                 identified additional environmental remediation liabilities of
                 $46 million, of which $28 million was discounted to a present
                 value of $13 million and $18 million was not discounted.
                 Assumptions used in the calculation of the present value amount
                 included an inflation factor of 2% and an interest rate of 7%
                 over a range of 22 to 30 years. Estimated receivables for
                 recoverable costs related to adoption of SOP 96-1 were $4
                 million. The net unfavorable effect of adoption on income from
                 operations at January 1, 1997, was $27 million.

                 Earnings per share - In 1997, USX adopted Statement of
                 Financial Accounting Standards No. 128, "Earnings per Share"
                 (SFAS No. 128). This Statement establishes standards for
                 computing and presenting earnings per share (EPS). SFAS No. 128
                 requires dual presentation of basic and diluted EPS. Basic EPS
                 excludes dilution and is computed by dividing net income
                 available to common stockholders by the weighted average number
                 of common shares outstanding for the period. Diluted EPS
                 reflects the potential dilution that could occur if stock
                 options or convertible securities were exercised or converted
                 into common stock. The Company's adoption of SFAS No. 128 did
                 not materially change current and prior years' EPS.

                                                                             U-9

 
                Stock-based compensation - Effective January 1, 1996, USX
                adopted Statement of Financial Accounting Standards No. 123,
                "Accounting for Stock-Based Compensation" (SFAS No. 123), which
                establishes a fair value based method of accounting for employee
                stock-based compensation plans. The Standard permits companies
                to continue to apply the accounting provisions of Accounting
                Principles Board Opinion No. 25, "Accounting for Stock Issued to
                Employees" (APB No. 25), provided certain disclosures are made.
                USX has complied with SFAS No. 123 by following the accounting
                provisions of APB No. 25 and including the required disclosures
                at Note 21.

________________________________________________________________________________
3. DISCONTINUED OPERATIONS

                Effective October 31, 1997, USX sold its stock in Delhi Gas
                Pipeline Corporation and other subsidiaries of USX that comprise
                all of the Delhi Group (Delhi Companies). The transaction
                involved a gross purchase price of $762 million. Under the USX
                Restated Certificate of Incorporation (USX Certificate), USX was
                required to elect one of three options to return the value of
                the net proceeds received in the transaction to the holders of
                shares in USX-Delhi Group Common Stock (Delhi shareholders). Of
                the three options, USX elected to use the net proceeds of $195
                million, or $20.60 per share, to redeem all shares of Delhi
                Stock. The net proceeds were distributed to the Delhi
                shareholders on January 26, 1998.

                       The net proceeds were calculated in accordance with the
                USX Certificate by deducting from the gross purchase price,
                amounts of certain liabilities retained by the Delhi Companies
                as well as amounts necessary to provide for taxes incurred by
                USX in connection with the transaction, transaction fees and
                expenses, contingent liabilities of the Delhi Group and certain
                other liabilities and obligations not being assumed by the buyer
                (including the portion of USX's debt and preferred stock
                attributed to the Delhi Group). To the extent that the actual
                future cash outflows for the liabilities retained from the Delhi
                Companies vary from the amounts withheld from the proceeds, the
                difference will be attributed to the Marathon and U. S. Steel
                Groups.

                       The following is a calculation of the net proceeds
                available for distribution and redemption price:

 
 
                (In millions, except per share amount)
                ---------------------------------------------------------------------------------------------
                                                                                                
                Gross purchase price                                                                  $  762
                Less adjustments per stock purchase and sale agreement/(a)/                               10
                                                                                                      ------
                Adjusted purchase price                                                                  752
                Less deductions for:
                  Income taxes payable by USX with respect to the transaction       $ 208
                  Liabilities (contingent and otherwise) of or attributed to the
                    Delhi Group/(b)/                                                  346
                  Transaction costs, net of income taxes                                4                 558
                                                                                    -----              ------
                Plus interest earned on funds held for redemption from closing
                       date until redemption date, net of income taxes                                      1
                                                                                                       ------
                Net proceeds available for distribution                                                $  195
                                                                                                       ======
                Net proceeds per share/(c)/                                                            $20.60
                -------------------------------------------------------------------------------------------------------------


                /(a)/  Reflects liabilities retained by the Delhi Companies for
                       which adjustments were required under the stock purchase
                       and sale agreement.

                /(b)/  Includes debt and preferred stock attributed to the Delhi
                       Group at October 31, 1997.

                /(c)/  9,445,338 shares were reclassified to redeemable Delhi
                       Stock as of December 31, 1997.

                       The sale of the Delhi Companies resulted in a gain on
                disposal of $81 million, net of $206 million income taxes.

                       As of December 31, 1997, the balance sheet of the Delhi
                Group consisted of cash restricted for the redemption of Delhi
                Stock of $195 million and redeemable Delhi Stock in an equal and
                offsetting amount.

                       The financial results of the Delhi Group have been
                reclassified as discontinued operations for all periods
                presented in the Consolidated Statement of Operations and are
                summarized as follows:



                                                                               Year Ended December 31
                                                                                         --------------
                (In millions)                                                 1997/(a)/    1996   1995
                ---------------------------------------------------------------------------------------
                                                                                         
                Revenues                                                      $1,205      $1,062  $ 671
                Costs and expenses                                             1,190       1,031    647
                                                                              ------      ------  -----
                Income from operations                                            15          31     24
                Net interest and other financial costs                            23          21     16
                                                                              ------      ------  -----
                Income (loss) before income taxes                                 (8)         10      8
                Provision (credit) for estimated income taxes                     (7)          4      4
                                                                              ------      ------  -----
                Net income (loss)                                             $   (1)     $    6  $   4
                ---------------------------------------------------------------------------------------


                /(a)/  Represents ten months of operations.

U-10

 
________________________________________________________________________________
4. REVENUES


                The items below are included in revenues and costs and expenses,
                with no effect on income.

 
 
                (In millions)                                               1997          1996          1995
                ----------------------------------------------------------------------------------------------
                                                                                               
 
                Consumer excise taxes on petroleum products
                  and merchandise                                           $2,736        $2,768        $2,708
                Matching crude oil and refined product
                  buy/sell transactions settled in cash                      2,436         2,912         2,067
                ----------------------------------------------------------------------------------------------


________________________________________________________________________________
5. IMPAIRMENT OF LONG-LIVED ASSETS

                In 1995, USX adopted Statement of Financial Accounting Standards
                No. 121, "Accounting for the Impairment of Long-Lived Assets and
                for Long-Lived Assets to Be Disposed Of" (SFAS No. 121). SFAS
                No. 121 requires that long-lived assets, including related
                goodwill, be reviewed for impairment and written down to fair
                value whenever events or changes in circumstances indicate that
                the carrying value may not be recoverable.

                    Adoption of SFAS No. 121 resulted in an impairment charge
                included in 1995 costs and expenses of $675 million. The
                impaired assets primarily included certain domestic and
                international oil and gas properties, an idled refinery, surplus
                real estate and related goodwill.

                    USX assessed impairment of its oil and gas properties
                based primarily on a field-by-field approach. The predominant
                method used to determine fair value was a discounted cash flow
                approach and where available, comparable market values were
                used. The impairment provision reduced capitalized costs of oil
                and gas properties by $533 million.

                    In addition, the Indianapolis, Indiana refinery, which was
                temporarily idled in October 1993, was impaired by $126 million,
                including related goodwill. The impairment was based on a
                discounted cash flow approach and comparable market values.

                    Other long-lived assets written down included certain iron
                ore mineral rights and surplus real estate holdings. The
                impairment charge recognized for these assets was $16 million.

________________________________________________________________________________
6. OTHER ITEMS

 
 
                (In millions)                                                     1997         1996         1995
                ------------------------------------------------------------------------------------------------------
                                                                                                       
                NET INTEREST AND OTHER FINANCIAL COSTS
                 FROM CONTINUING OPERATIONS

                  INTEREST AND OTHER FINANCIAL INCOME:
                   Interest income                                                $  11        $   8        $  17
                   Other                                                             (6)          (1)           3
                                                                                  -----        -----        -----
                     Total                                                            5            7           20
                                                                                  -----        -----        -----
                  INTEREST AND OTHER FINANCIAL COSTS:
                   Interest incurred                                                289          345          395
                   Less interest capitalized                                         31           11           13
                                                                                  -----        -----        -----
                     Net interest                                                   258          334          382
                   Interest on tax issues                                            20           14            6  /(a)/
                   Financial costs on trust preferred securities                     10            -            -
                   Financial costs on preferred stock of subsidiary                  21           21           21
                   Amortization of discounts                                          6            9           27
                   Expenses on sales of accounts receivable                          40           40           46
                   Adjustment to settlement value of indexed debt                   (10)           6            -
                   Other                                                              7            4            4
                                                                                  -----        -----        -----
                     Total                                                          352          428          486
                                                                                  -----        -----        -----
                NET INTEREST AND OTHER FINANCIAL COSTS                            $ 347        $ 421        $ 466
                ----------------------------------------------------------------------------------------------------

                /(a)/  Includes a $20 million benefit related to refundable
                       federal income taxes paid in prior years.

                ________________________________________________________________
                FOREIGN CURRENCY TRANSACTIONS

                   For 1997, 1996 and 1995, the aggregate foreign currency
                   transaction gains (losses) included in determining income
                   from continuing operations were $4 million, $(24) million and
                   $3 million, respectively.

                                                                            U-11

 
________________________________________________________________________________
7. EXTRAORDINARY LOSS

                On December 30, 1996, USX irrevocably called for redemption on
                January 30, 1997, $120 million of 8-1/2% Sinking Fund
                Debentures, resulting in a 1996 extraordinary loss of $9
                million, net of a $5 million income tax benefit. In 1995, USX
                extinguished $553 million of debt prior to maturity, primarily
                consisting of Zero Coupon Convertible Senior Debentures, with a
                carrying value of $393 million, and $83 million of 8-1/2%
                Sinking Fund Debentures, which resulted in an extraordinary loss
                of $7 million, net of a $4 million income tax benefit.

________________________________________________________________________________
8. GAIN ON AFFILIATE STOCK OFFERING

                In 1996, an aggregate of 6.9 million shares of RMI Titanium
                Company (RMI) common stock was sold in a public offering at a
                price of $18.50 per share and total net proceeds of $121
                million. Included in the offering were 2.3 million shares sold
                by USX for net proceeds of $40 million. USX recognized a total
                pretax gain of $53 million, of which $34 million was
                attributable to the shares sold by USX and $19 million was
                attributable to the increase in value of USX's investment as a
                result of the shares sold by RMI. The income tax effect related
                to the total gain was $19 million. As a result of this
                transaction, USX's ownership in RMI decreased from approximately
                50% to 27%. USX continues to account for its investment in RMI
                under the equity method of accounting.

________________________________________________________________________________
9. OPERATIONS AND SEGMENT INFORMATION CONTINUING OPERATIONS

                After the redemption of the Delhi Stock on January 26, 1998, USX
                has two classes of common stock: Marathon Stock and Steel Stock,
                which are intended to reflect the performance of the Marathon
                Group and the U. S. Steel Group, respectively. The operations
                and segments of USX conform to USX's group structure. A
                description of each group and its products and services is as
                follows:

                      MARATHON GROUP - The Marathon Group is involved in
                      worldwide exploration, production, transportation and
                      marketing of crude oil and natural gas; domestic refining,
                      marketing and transportation of petroleum products; and
                      power generation. Marathon Group revenues as a percentage
                      of total consolidated USX revenues were 69% in 1997, 71%
                      in 1996 and 68% in 1995. See five-year operating data on
                      page U-35.

                      U. S. STEEL GROUP - The U. S. Steel Group, which consists
                      primarily of steel operations, includes the largest
                      domestic integrated steel producer and is primarily
                      engaged in the production and sale of steel mill products,
                      coke and taconite pellets. The U. S. Steel Group also
                      includes the management of mineral resources, domestic
                      coal mining, and engineering and consulting services.
                      Other businesses that are part of the U. S. Steel Group
                      include real estate development and management and leasing
                      and financing activities. U. S. Steel Group revenues as a
                      percentage of total consolidated USX revenues were 31% in
                      1997, 29% in 1996 and 32% in 1995. See five-year operating
                      data on page U-37.


INDUSTRY SEGMENT:

 
 
                                                                                                    Depreciation,
                                            Revenues                                                 Depletion
                                            Between             Total      Operating                    and           Capital
(In millions)          Year     Revenues    Groups/(a)/       Revenues     Income/(b)/    Assets    Amortization   Expenditures
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                                              
Marathon Group:          1997    $15,649     $ 105             $15,754       $    866     $10,565        $  664         $1,038
                         1996     16,307        87              16,394          1,234      10,151           693            751
                         1995     13,856        57              13,913            113      10,109           817            642
- ------------------------------------------------------------------------------------------------------------------------------------
U. S. Steel Group:       1997      6,939         2               6,941            704       6,694           303            261
                         1996      6,670         -               6,670            360       6,580           292            337
                         1995      6,557         -               6,557            500       6,521           318            324
- ------------------------------------------------------------------------------------------------------------------------------------
Adjustments for          1997          -      (107)               (107)             -          25             -             74
 Discontinued            1996          -       (87)                (87)             -         249             -             80
 Operations and          1995          -       (57)                (57)             -         113             -             50
 Eliminations
- ------------------------------------------------------------------------------------------------------------------------------------
Total USX Corporation:   1997    $22,588     $   -             $22,588       $  1,570     $17,284        $  967         $1,373
                         1996     22,977         -              22,977          1,594      16,980           985          1,168
                         1995     20,413         -              20,413            613      16,743         1,135          1,016
- ------------------------------------------------------------------------------------------------------------------------------------


/(a)/ Intergroup sales and transfers were conducted on an arm's-length basis.
/(b)/ Operating income includes inventory market valuation charges (credits) for
      the Marathon Group of $284 million, $(209) million and $(70) million in
      1997, 1996 and 1995, respectively (Note 19); and in 1995, impairment of
      long-lived asset charges of $659 million for the Marathon Group and $16
      million for the U. S. Steel Group (Note 5). Operating income does not
      include dividend and affiliate income, gains from changes in ownership,
      gains and losses on disposal of investments and other income, which are
      included in income from operations in the Consolidated Statement of
      Operations.

U-12

 
EXPORT SALES:
    The information below summarizes export sales by geographic area for the 
U.S. Steel Group. Export sales from domestic operations for the Marathon Group
were not material.



(In millions)                                                     1997   1996   1995
- -------------------------------------------------------------------------------------------
                                                                       
Far East                                                          $  14  $  58  $ 338
Europe                                                              122    103    142
Other                                                               302    232    224
                                                                  -----  -----  -----
   Total export sales                                             $ 438  $ 393  $ 704
- -------------------------------------------------------------------------------------------


GEOGRAPHIC AREA:

  The information below summarizes the operations in different geographic areas.
Transfers between geographic areas are at prices which approximate market.



                                                                 Revenues
                                                   -------------------------------
                                                     Within      Between              Operating
                                                   Geographic   Geographic              Income
(In millions)                               Year     Areas       Areas      Total      (Loss)    Assets
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                               
Marathon Group:
   United States                            1997   $  15,034    $    -      $ 15,034   $  607    $ 6,683
                                            1996      15,509         -        15,509      866      6,604
                                            1995      13,162         -        13,162      129      6,791
   Europe                                   1997         698         -           698      268      2,144
                                            1996         859         -           859      368      2,230
                                            1995         726         -           726      109      2,372
   Other International                      1997          22        39            61       (9)     1,738
                                            1996          26        43            69        -      1,317
                                            1995          25        85           110     (125)       946
   Eliminations                             1997           -       (39)          (39)       -          -
                                            1996           -       (43)          (43)       -          -
                                            1995           -       (85)          (85)       -          -
   Total Marathon Group                     1997   $  15,754    $    -      $ 15,754   $  866    $10,565
                                            1996      16,394         -        16,394    1,234     10,151
                                            1995      13,913         -        13,913      113     10,109
- ------------------------------------------------------------------------------------------------------------------------------------
U. S. Steel Group:
   United States                            1997   $   6,926    $    -      $ 6,926    $  705    $ 6,667
                                            1996       6,642         -        6,642       363      6,552
                                            1995       6,538         4        6,542       501      6,492
   International                            1997          15         -           15        (1)        27
                                            1996          28         -           28        (3)        28
                                            1995          19         -           19        (1)        29
   Eliminations                             1997           -         -            -         -          -
                                            1996           -         -            -         -          -
                                            1995           -        (4)          (4)        -          -
   Total U. S. Steel Group                  1997   $   6,941    $    -      $ 6,941    $  704    $ 6,694
                                            1996       6,670         -        6,670       360      6,580
                                            1995       6,557         -        6,557       500      6,521
- ------------------------------------------------------------------------------------------------------------------------------------
Adjustments for                             1997   $    (107)   $    -      $  (107)   $    -    $    25
  Discontinued Operations                   1996         (87)        -          (87)        -        249
  and Eliminations                          1995         (57)        -          (57)        -        113
- ------------------------------------------------------------------------------------------------------------------------------------
Total USX Corporation                       1997   $  22,588    $    -      $22,588    $1,570   $ 17,284
                                            1996      22,977         -       22,977     1,594     16,980
                                            1995      20,413         -       20,413       613     16,743
- ------------------------------------------------------------------------------------------------------------------------------------


                                                                            U-13

 
________________________________________________________________________________
10. PENSIONS

                USX has noncontributory defined benefit plans covering
                substantially all employees. Benefits under these plans are
                based upon years of service and final average pensionable
                earnings, or a minimum benefit based upon years of service,
                whichever is greater. In addition, pension benefits under the
                contributory benefit provisions cover certain participating
                salaried employees and are based upon a percent of total career
                pensionable earnings. The funding policy for defined benefit
                plans provides that payments to the pension trusts shall be
                equal to the minimum funding requirements of ERISA plus such
                additional amounts as may be approved.

                   USX also participates in multiemployer plans, most of which
                are defined benefit plans associated with coal operations.

                PENSION COST (CREDIT) - The defined benefit cost from continuing
                operations for major plans for 1997, 1996 and 1995 was
                determined assuming an expected long-term rate of return on plan
                assets of 9.5%, 10% and 10%, respectively, and was as follows:



                (In millions)                                                  1997          1996          1995
                ----------------------------------------------------------------------------------------------------
                                                                                                         
                USX major plans:
                Cost of benefits earned during the period                       $    96      $   104       $    83
                Interest cost on projected benefit obligation
                  (7.5% for 1997; 7% for 1996; and 8% for 1995)                     562          568           604
                Return on assets - actual return                                 (1,972)      (1,275)       (2,039)
                                 - deferred gain                                  1,144          422         1,200
                Net amortization of unrecognized losses                               3            7             -
                                                                                 ------      -------       -------
                   Total major plans                                               (167)        (174)         (152)
                Multiemployer and other USX plans                                     6            6             6
                                                                                 ------      -------       -------
                   Total periodic pension credit                                   (161)        (168)         (146)
                Curtailment, settlement and termination costs                         4            6             2
                                                                                 ------      -------       -------
                   Total pension credit                                         $  (157)     $  (162)      $  (144)
                ----------------------------------------------------------------------------------------------------


                FUNDS' STATUS - The assumed discount rate used to measure the
                benefit obligations of major plans was 7% at December 31, 1997,
                and 7.5% at December 31, 1996. The assumed rate of future
                increases in compensation levels was 4% at both year-ends. The
                following table sets forth the plans' funded status and the
                amounts reported in USX's consolidated balance sheet:



                (In millions)                                                  December 31          1997      1996
                -------------------------------------------------------------------------------------------------------------------
                                                                                                        
                Reconciliation of funds' status to reported amounts:
                Projected benefit obligation (PBO)/(a)/                                             $(8,085)  $(7,924)
                Plan assets at fair market value/(b)/                                                10,925     9,883
                                                                                                    -------   -------
                       Assets in excess of PBO/(c)/                                                   2,840     1,959
                Unrecognized net gain from transition                                                  (249)     (300)
                Unrecognized prior service cost                                                         628       640
                Unrecognized net gain                                                                  (993)     (311)
                Additional minimum liability/(d)/                                                       (79)      (77)
                                                                                                    -------   -------
                       Net pension asset included in balance sheet                                  $ 2,147   $ 1,911
                -------------------------------------------------------------------------------------------------------------------
                /(a)/  PBO includes:
                          Accumulated benefit obligation (ABO)                                      $(7,490)  $(7,394)
                          Vested benefit obligation                                                  (7,031)   (6,931)
                /(b)/  Types of assets held:
                          Stocks of other corporations                                                   56%       56%
                          U.S. Government securities                                                     17%       18%
                          Corporate debt instruments and other                                           27%       26%

                /(c)/  Includes several small plans that have ABOs in excess of plan assets:
                          PBO                                                                       $  (151)  $  (135)
                          Plan assets                                                                    24        18
                                                                                                    -------   -------
                            PBO in excess of plan assets                                            $  (127)  $  (117)
                /(d)/  Additional minimum liability recorded was offset by the following:
                          Intangible asset                                                          $    30   $    42
                          Stockholders' equity adjustment net of deferred income tax                     32        22
                ------------------------------------------------------------------------------------------------------------------


U-14

 
________________________________________________________________________________
11. POSTRETIREMENT BENEFITS OTHER THAN PENSIONS

                USX has defined benefit retiree health and life insurance plans
                covering most employees upon their retirement. Health benefits
                are provided, for the most part, through comprehensive hospital,
                surgical and major medical benefit provisions subject to various
                cost sharing features. Life insurance benefits are provided to
                nonunion and certain union represented retiree beneficiaries
                primarily based on employees' annual base salary at retirement.
                For other union retirees, benefits are provided for the most
                part based on fixed amounts negotiated in labor contracts with
                the appropriate unions. Except for certain life insurance
                benefits paid from reserves held by insurance carriers, most
                benefits have not been prefunded.

                POSTRETIREMENT BENEFIT COST - Postretirement benefit cost for
                defined benefit plans for 1997, 1996 and 1995 was determined
                assuming discount rates of 7.5%, 7% and 8%, respectively, and an
                expected return on plan assets of 9.5% in 1997 and 10% for 1996
                and 1995:




                (In millions)                                                     1997        1996        1995
                ------------------------------------------------------------------------------------------------------
                                                                                                 
                Cost of benefits earned during the period                         $  21       $  26       $  26
                Interest on accumulated postretirement benefit obligation (APBO)    175         183         198
                Return on assets - actual return                                    (19)        (12)        (11)
                                 - deferred gain (loss)                               8           1          (1)
                Amortization of unrecognized (gains) losses                         (12)          2          (1)
                                                                                   -----      -----       -----
                   Total defined benefit plans                                      173         200         211
                Multiemployer plans/(a)/                                             15          15          15
                                                                                   -----      -----       -----
                   Total postretirement benefit cost                              $ 188       $ 215       $ 226
                ------------------------------------------------------------------------------------------------------

                /(a)/  Payments are made to a multiemployer benefit plan created
                       by the Coal Industry Retiree Health Benefit Act of 1992
                       based on assigned beneficiaries receiving benefits. The
                       present value of this unrecognized obligation is broadly
                       estimated to be $108 million, including the effects of
                       future medical inflation, and this amount could increase
                       if additional beneficiaries are assigned.

                FUNDS' STATUS - The following table sets forth the plans' funded
                status and the amounts reported in USX's consolidated balance
                sheet:



                (In millions)                                         December 31                 1997    1996
                --------------------------------------------------------------------------------------------------------------  
                                                                                                 
                Reconciliation of funds' status to reported amounts:
                Fair value of plan assets                                                         $  258  $  111
                                                                                                  ------  ------
                APBO attributable to:
                  Retirees                                                                         1,772   1,784
                  Fully eligible plan participants                                                   271     233
                  Other active plan participants                                                     408     393
                                                                                                  ------  ------
                     Total APBO                                                                    2,451   2,410
                                                                                                  ------  ------
                     APBO in excess of plan assets                                                 2,193   2,299
                Unrecognized net gain                                                                254     260
                Unrecognized prior service cost                                                        7       6
                                                                                                  ------  ------
                     Accrued liability included in balance sheet                                  $2,454  $2,565
                ------------------------------------------------------------------------------------------------------------ 


                     The assumed discount rate used to measure the APBO was 7%
                and 7.5% at December 31, 1997, and December 31, 1996,
                respectively. The assumed rate of future increases in
                compensation levels was 4% at both year-ends. The weighted
                average health care cost trend rate in 1998 is approximately 8%,
                declining to an ultimate rate in 2004 of approximately 5%. A one
                percentage point increase in the assumed health care cost trend
                rates for each future year would have increased the aggregate of
                the service and interest cost components of the 1997 net
                periodic postretirement benefit cost by $22 million and would
                have increased the APBO as of December 31, 1997, by $242
                million.

                                                                            U-15

 
- --------------------------------------------------------------------------------
12. INCOME TAXES

     Provisions (credits) for estimated income taxes on income from continuing
     operations were:



                                            1997                              1996                                 1995
                             -------------------------------     ------------------------------    ---------------------------------
          (In millions)         Current   Deferred      Total      Current  Deferred     Total    Current     Deferred        Total
                                                                                                   
          Federal                  $208      $ 163       $371         $142     $ 151     $ 293      $  80        $ (71)       $   9
          State and local             7         32         39           12        21        33         19          (31)         (12)
          Foreign                    12         28         40            4        82        86         15           31           46
                                   ----      -----       ----   ----------  --------  --------   --------   ----------   ----------
            Total                  $227      $ 223       $450         $158     $ 254     $ 412      $ 114        $ (71)       $  43
- ------------------------------------------------------------------------------------------------------------------------------------
 
 
     A reconciliation of federal statutory tax rate (35%) to total provisions
     from continuing operations follows:

 
 
          (In millions)                                                            1997            1996            1995
          --------------------------------------------------------------------------------------------------------------------------
                                                                                                           
          Statutory rate applied to income from continuing operations    
           before income taxes                                                     $ 475           $ 476            $  92
          Credits other than foreign tax credits                                     (24)            (48)              (1)
          State and local income taxes after federal income tax effects               25              22               (8)
          Effects of foreign operations, including foreign tax credits               (11)            (16)             (35) /(a)/
          Effects of partially-owned companies                                        (9)            (16)             (15)
          Dispositions of subsidiary investments                                       -              (8)              (6)
          Excess percentage depletion                                                (10)             (7)              (8)
          Nondeductible business and amortization expenses                             5               5               17
          Adjustment of prior years' income taxes                                      2               3                2
          Adjustment of valuation allowances                                          (5)              -                6
          Other                                                                        2               1               (1)
                                                                                --------        --------        ----------
             Total provisions on income from continuing operations                 $ 450           $ 412            $  43
          --------------------------------------------------------------------------------------------------------------------------


          /(a)/  Includes incremental tax benefits of $39 million resulting from
                 USX's election to credit, rather than deduct, certain foreign
                 income taxes for federal income tax purposes.

                 Deferred tax assets and liabilities resulted from the
                 following:



          (In millions)                                                           December  31      1997           1996           
          --------------------------------------------------------------------------------------------------------------------------
                                                                                                                      
          Deferred tax assets:                                                                                                    
           Minimum tax credit carryforwards                                                          $  222         $  436         
           General business credit carryforwards                                                          -             24         
           State tax loss carryforwards (expiring in 1998 through 2012)                                 127            141         
           Foreign tax loss carryforwards (portion of which expire in 1998 through 2012)                483            519         
           Employee benefits                                                                          1,004          1,025         
           Receivables, payables and debt                                                                63             79         
           Expected federal benefit for:                                                                                           
            Crediting certain foreign deferred income taxes                                             249            216         
            Deducting state and other foreign deferred income taxes                                      47             41         
           Contingency and other accruals                                                               198            167         
           Other                                                                                         59            155         
           Valuation allowances                                                                        (363)          (396)        
                                                                                                     ------      ---------         
               Total deferred tax assets/(a)/                                                         2,089          2,407         
                                                                                                     ------      ---------         
          Deferred tax liabilities:                                                                                                
           Property, plant and equipment                                                              2,041          2,180         
           Prepaid pensions                                                                             786            721         
           Inventory                                                                                    212            319         
           Other                                                                                        167            228         
                                                                                                     ------      ---------         
               Total deferred tax liabilities                                                         3,206          3,448         
                                                                                                     ------      ---------         
                Net deferred tax liabilities                                                         $1,117         $1,041         
          --------------------------------------------------------------------------------------------------------------------------


          /(a)/  USX expects to generate sufficient future taxable income to
                 realize the benefit of its deferred tax assets. In addition,
                 the ability to realize the benefit of foreign tax credits is
                 based upon certain assumptions concerning future operating
                 conditions (particularly as related to prevailing oil prices),
                 income generated from foreign sources and USX's tax profile in
                 the years that such credits may be claimed.

                 The consolidated tax returns of USX for the years 1990 through
                 1994 are under various stages of audit and administrative
                 review by the IRS. USX believes it has made adequate provision
                 for income taxes and interest which may become payable for
                 years not yet settled.

                 Pretax income from continuing operations included $250 million,
                 $339 million and $(50) million attributable to foreign sources
                 in 1997, 1996 and 1995, respectively.

                 Undistributed earnings of consolidated foreign subsidiaries at
                 December 31, 1997, amounted to $108 million. No provision for
                 deferred U.S. income taxes has been made because USX intends to
                 permanently reinvest such earnings in its foreign operations.
                 If such earnings were not permanently reinvested, a deferred
                 tax liability of $38 million would have been required.

U-16

 
- --------------------------------------------------------------------------------
13. SALES OF RECEIVABLES

             USX has an agreement (the program) at December 31, 1997, to sell
             an undivided interest in certain accounts receivable. Payments are
             collected from the sold accounts receivable; the collections are
             reinvested in new accounts receivable for the buyers; and a yield,
             based on defined short-term market rates, is transferred to the
             buyers. At December 31, 1997, the amount sold under the program
             that had not been collected was $350 million, which will be
             forwarded to the buyers at the end of the agreement in 1998, or in
             the event of earlier contract termination. If USX does not have a
             sufficient quantity of eligible accounts receivable to reinvest in
             for the buyers, the size of the program will be reduced
             accordingly. The amounts sold under the current and previous
             programs averaged $705 million, $740 million and $744 million for
             years 1997, 1996 and 1995, respectively. (For most of 1997 and for
             the years 1996 and 1995, the Marathon and Delhi Groups had a
             separate accounts receivable program that was terminated in late
             1997.) The buyers have rights to a pool of receivables that must be
             maintained at a level of at least 115% of the program's size. USX
             does not generally require collateral for accounts receivable, but
             significantly reduces credit risk through credit extension and
             collection policies, which include analyzing the financial
             condition of potential customers, establishing credit limits,
             monitoring payments and aggressively pursuing delinquent accounts.
             In the event of a change in control of USX, USX may be required to
             forward to the buyers, payments collected on the sold accounts
             receivable.

- --------------------------------------------------------------------------------
14. INVESTMENTS AND LONG-TERM RECEIVABLES   

 
 
             (In millions)                                                December 31             1997    1996                  
             -----------------------------------------------------------------------------------------------------------------------
                                                                                                                     
              Equity method investments                                                           $  838  $  549                 
              Other investments                                                                       88      94                 
              Deposit in property exchange trusts                                                      -      98                 
              Receivables due after one year                                                          71      67                 
              Forward currency contracts                                                               -      16                 
              Other                                                                                   31      30                 
                                                                                                  ------  ------                 
                Total                                                                             $1,028  $  854                 
             -----------------------------------------------------------------------------------------------------------------------
 
 
               Summarized financial information of affiliates accounted for by
              the equity method of accounting follows:

 
 
             (In millions)                                               1997    1996    1995                                       
             -----------------------------------------------------------------------------------------------------------------------
                                                                               
             Income data--year:                                                                                                     
              Revenues                                                 $3,705  $3,274  $3,531                                       
              Operating income                                            342     318     339                                       
              Net income                                                  191     193     187                                       
             -----------------------------------------------------------------------------------------------------------------------
             Balance sheet data  December 31:                                                                                       
              Current assets                                           $1,094  $  925                                               
              Noncurrent assets                                         3,476   2,728                                               
              Current liabilities                                         863     781                                               
              Noncurrent liabilities                                    1,521   1,582      
             -----------------------------------------------------------------------------------------------------------------------


               Effective June 1, 1997, USX entered into a strategic partnership
             with two limited partners to acquire an interest in three coke
             batteries at its U. S. Steel Group's Clairton (Pa.) Works and to
             operate and sell coke and byproducts from those facilities. USX is
             the general partner and is responsible for purchasing, operations
             and products marketing. Proceeds to USX as a result of the
             transaction were $361 million. The related unamortized deferred
             gains of $244 million at December 31, 1997 (included in deferred
             credits and other liabilities) are being recognized over the life
             of the partnership's assets. USX's partnership interest is
             accounted for under the equity method of accounting. The fair value
             attributed to USX for its general partnership interest exceeds the
             historical basis of contributed net assets by $38 million and is
             being amortized on a straight-line basis over the life of the
             partnership.

               Dividends and partnership distributions received from equity
             affiliates were $34 million in 1997, $49 million in 1996 and $85
             million in 1995.

               USX purchases from equity affiliates totaled $461 million, $509
             million and $458 million in 1997, 1996 and 1995, respectively. USX
             sales to equity affiliates totaled $812 million, $830 million and
             $769 million in 1997, 1996 and 1995, respectively.

- --------------------------------------------------------------------------------
15. SHORT-TERM CREDIT AGREEMENT

             USX has a short-term credit agreement totaling $125 million at
             December 31, 1997. Interest is based on the bank's prime rate or
             London Interbank Offered Rate (LIBOR), and carries a facility fee
             of .15%. Certain other banks provide short-term lines of credit
             totaling $200 million which require a .125% fee or maintenance of
             compensating balances of 3%. At December 31, 1997, there were no
             borrowings against these facilities. USX had other outstanding
             short-term borrowings of $121 million.

                                                                            U-17

 
- --------------------------------------------------------------------------------
16. LONG-TERM DEBT

 
 
                                                                       Interest                           December 31
             (In millions)                                              Rates-%        Maturity          1997    1996
             -----------------------------------------------------------------------------------------------------------------------
                                                                                                      
             USX Corporation:
              Revolving credit/(a)/                                                       2001          $    -   $   -
              Notes payable                                          6/3//8-9/4//5     1998-2023         2,239   2,398
              Foreign currency obligations/(b)/                      5/3//4               1998              68      75
              Zero Coupon Convertible Senior Debentures/(c)/         7/7//8                                  -      41
              Convertible Subordinated Debentures/(c)/               5/3//4                                  -     180
              Convertible Subordinated Debentures/(c)/               7                                       -     227
              Obligations relating to Industrial Development and
               Environmental Improvement Bonds and Notes/(d)/        3/9//20-6/7//8    1998-2030           470     473
              Indexed debt/(e)/                                      6/3//4               2000             113     123
              All other obligations, including sale-leaseback
               financing and capital leases                                            1998-2012            98     104
             Consolidated subsidiaries:
              Guaranteed Notes                                       7                    2002             135     135
              Guaranteed Loan/(f)/                                   9/1//20           1998-2006           265     283
              Notes payable                                          8/1//2            1998-2001             3       9
              Sinking Fund Debentures/(c)/                           8/1//2                                  -     120
              All other obligations, including capital leases                          1998-2009            38      73
                                                                                                        ------  ------
                 Total/(g)(h)/                                                                          3,429   4,241
             Less unamortized discount                                                                      26      29
             Less amount due within one year                                                               471     353
                                                                                                        ------  ------
                 Long-term debt due after one year                                                      $2,932  $3,859
             -----------------------------------------------------------------------------------------------------------------------
 

             /(a)/ An amended agreement which terminates in August 2001,
                   provides for borrowing under a $2,350 million revolving
                   credit facility. Interest is based on defined short-term
                   market rates. During the term of this agreement, USX is
                   obligated to pay a variable facility fee on total
                   commitments, which was .15 % at December 31, 1997.

             /(b)/ Foreign currency exchange agreements were executed in
                   connection with the Swiss franc obligations, which
                   effectively fixed the principal repayment at $59 million at
                   December 31, 1997, and interest in U.S. dollars, thereby
                   eliminating currency exchange risks (Note 28).

             /(c)/ These debentures were redeemed during 1997.

             /(d)/ At December 31, 1997, USX had outstanding obligations
                   relating to Environmental Improvement Bonds in the amount of
                   $256 million, which were supported by letter of credit
                   arrangements that could become short-term obligations under
                   certain circumstances.

             /(e)/ The indexed debt represents 6 3/4% exchangeable notes due
                   February 1, 2000, in the principal amount of $117 million or
                   $21.375 per note, which was the market price per share of RMI
                   common stock on November 26, 1996. At maturity, the principal
                   amount of each note will be mandatorily exchanged by USX into
                   shares of RMI common stock (or, at USX's option, the cash
                   equivalent and/or such other consideration as permitted or
                   required by the terms of the notes) at a defined exchange
                   rate, which is based on the average market price of RMI
                   common stock valued in January 2000. The carrying value of
                   the notes is adjusted quarterly to settlement value and any
                   resulting adjustment is charged or credited to income and
                   included in net interest and other financial costs.

             /(f)/ The guaranteed loan was used to fund a portion of the costs
                   in connection with the development of the East Brae Field and
                   the SAGE pipeline in the North Sea. A portion of proceeds
                   from a long-term gas sales contract is dedicated to loan
                   service under certain circumstances. Prepayment of the loan
                   may be required under certain situations, including events
                   impairing the security interest.

             /(g)/ Required payments of long-term debt for the years 1999-2002
                   are $70 million, $173 million, $289 million and $293 million,
                   respectively.

             /(h)/ In the event of a change in control of USX, as defined in the
                   related agreements, debt obligations totaling $3,001 million
                   may be declared immediately due and payable. The principal
                   obligations subject to such a provision are Notes payable-
                   $2,239 million; and Guaranteed Loan $265 million. In such
                   event, USX may also be required to either repurchase the
                   leased Fairfield slab caster for $110 million or provide a
                   letter of credit to secure the remaining obligation.

U-18

 
- --------------------------------------------------------------------------------
17. PROPERTY, PLANT AND EQUIPMENT

 
 
             (In millions)                                          December 31        1997      1996
             -----------------------------------------------------------------------------------------------------------------------
                                                                                        
             Marathon Group                                                            $17,233    $16,329
             U. S. Steel Group                                                           8,295      8,347
             Delhi Group                                                                     -      1,008
                                                                                       -------  ---------
                  Total                                                                 25,528     25,684
             Less accumulated depreciation, depletion and amortization                  15,466     15,280
                                                                                       -------  ---------
                  Net                                                                  $10,062    $10,404
             -----------------------------------------------------------------------------------------------------------------------


                Property, plant and equipment includes gross assets acquired
             under capital leases (including sale-leasebacks accounted for as
             financings) of $134 million at December 31, 1997, and $141 million
             at December 31, 1996; related amounts in accumulated depreciation,
             depletion and amortization were $94 million and $91 million,
             respectively.

- --------------------------------------------------------------------------------
18. LEASES

                Future minimum commitments for capital leases (including sale-
             leasebacks accounted for as financings) and for operating leases
             having remaining noncancelable lease terms in excess of one year
             are as follows:



                                                                                  Capital   Operating
             (In millions)                                                         Leases     Leases
             -----------------------------------------------------------------------------------------------------------------------
                                                                                              
             1998                                                                  $  13      $  226
             1999                                                                     13         190
             2000                                                                     13         252
             2001                                                                     13         170
             2002                                                                     13         101
             Later years                                                             142         239
             Sublease rentals                                                          -         (30)
                                                                                   -----       ----- 
               Total minimum lease payments                                          207      $1,148
                                                                                               =====
             Less imputed interest costs                                              85
                                                                                   -----
               Present value of net minimum lease payments
                included in long-term debt                                         $ 122
             -----------------------------------------------------------------------------------------------------------------------

 
                Operating lease rental expense from continuing operations:

             (In millions)                                                1997      1996        1995
             -----------------------------------------------------------------------------------------------------------------------
                                                                                                           
              Minimum rental                                             $ 237     $ 227      $  218
              Contingent rental                                             16        15          19
              Sublease rentals                                              (8)       (8)         (8)
                                                                         -----     -----   ---------
               Net rental expense                                        $ 245     $ 234      $  229
             -----------------------------------------------------------------------------------------------------------------------


                USX leases a wide variety of facilities and equipment under
             operating leases, including land and building space, office
             equipment, production facilities and transportation equipment. Most
             long-term leases include renewal options and, in certain leases,
             purchase options. In the event of a change in control of USX, as
             defined in the agreements, or certain other circumstances,
             operating lease obligations totaling $129 million may be declared
             immediately due and payable.

                                                                            U-19

 
- --------------------------------------------------------------------------------
19. INVENTORIES

 
 
             (In millions)                              December 31   1997    1996
             -----------------------------------------------------------------------------------------------------------------------
                                                                    
             Raw materials                                           $  582  $  594
             Semi-finished products                                     331     309
             Finished products                                          922     908
             Supplies and sundry items                                  134     128
                                                                     ------  ------
                  Total (at cost)                                     1,969   1,939
             Less inventory market valuation reserve                    284       -
                                                                     ------  ------
                  Net inventory carrying value                       $1,685  $1,939
             -----------------------------------------------------------------------------------------------------------------------


                At December 31, 1997, and December 31, 1996, the LIFO method
             accounted for 92% and 93%, respectively, of total inventory value.
             Current acquisition costs were estimated to exceed the above
             inventory values at December 31 by approximately $300 million and
             $340 million in 1997 and 1996, respectively.

                The inventory market valuation reserve reflects the extent that
             the recorded LIFO cost basis of crude oil and refined products
             inventories exceeds net realizable value. The reserve is decreased
             to reflect increases in market prices and inventory turnover and
             increased to reflect decreases in market prices. Changes in the
             inventory market valuation reserve result in noncash charges or
             credits to costs and expenses.
 
- --------------------------------------------------------------------------------
20. SUPPLEMENTAL CASH FLOW INFORMATION

 
 
             (In millions)                                                1997       1996       1995
             -----------------------------------------------------------------------------------------------------------------------
                                                                                             
             CASH USED IN OPERATING ACTIVITIES INCLUDED:
              Interest and other financial costs paid
               (net of amount capitalized)                             $   (382)  $   (488)   $  (605)
              Income taxes paid                                            (400)      (127)      (170)
             _______________________________________________________________________________________________________________________
             COMMERCIAL PAPER AND REVOLVING CREDIT ARRANGEMENTS  NET:
              Commercial paper - issued                                $      -   $  1,422    $ 2,434
                               - repayments                                   -     (1,555)    (2,651)
              Credit agreements - borrowings                             10,454     10,356      4,719
                                - repayments                            (10,449)   (10,340)    (4,659)
              Other credit arrangements - net                                36        (36)        40
                                                                       --------   --------   --------
                 Total                                                 $     41   $   (153)  $   (117)
             -----------------------------------------------------------------------------------------------------------------------
             NONCASH INVESTING AND FINANCING ACTIVITIES:
              Common stock issued for dividend reinvestment
               and employee stock plans                                $     10   $      6   $     21
              Acquisition of assets - debt issued                             -          2          -
              Disposal of assets - notes and common stock received            -         12          9
                                 - liabilities assumed by buyers            240         25          -
              Trust preferred securities exchanged for preferred stock      182          -          -
             -----------------------------------------------------------------------------------------------------------------------
  

- --------------------------------------------------------------------------------
21. STOCK-BASED COMPENSATION PLANS

                The 1990 Stock Plan, as amended, authorizes the Compensation
             Committee of the Board of Directors to grant restricted stock and
             stock options to key management employees. Such employees are
             generally granted awards of the class of common stock intended to
             reflect the performance of the group(s) to which their work
             relates. Up to .5 percent of the outstanding Marathon Stock and .8
             percent of the outstanding Steel Stock, as determined on December
             31 of the preceding year, are available for grants during each
             calendar year the 1990 Plan is in effect. In addition, awarded
             shares that do not result in shares being issued are available for
             subsequent grant in the same year, and any ungranted shares from
             prior years' annual allocations are available for subsequent grant
             during the years the 1990 Plan is in effect. As of December 31,
             1997, 7,452,556 Marathon Stock shares and 2,272,170 Steel Stock
             shares were available for grants in 1998. The Stock-Based
             Compensation Plans' activity below includes the Delhi Stock prior
             to its January 1998 redemption (Note 3).

                Restricted stock represents stock granted for such
             consideration, if any, as determined by the Compensation Committee,
             subject to provisions for forfeiture and restricting transfer.
             Those restrictions may be removed as conditions such as
             performance, continuous service and other criteria are met.
             Restricted stock is issued at the market price per share at the
             date of grant and vests over service periods that range from one to
             five years.

U-20

 
                Deferred compensation is charged to stockholders' equity when
             the restricted stock is granted and subsequently adjusted for
             changes in the market value of the underlying stock. The deferred
             compensation is expensed over the balance of the vesting period and
             adjusted if conditions of the restricted stock grant are not met.

                The following table presents information on restricted stock
             grants:



                                           Marathon Stock                     Steel Stock                  Delhi Stock     
                                    -----------------------------    --------------------------       -------------------------
                                      1997       1996      1995      1997        1996      1995       1997      1996      1995     
             -----------------------------------------------------------------------------------------------------------------------
                                                                                                     
             Number of shares                                                                                                     
              granted                  20,430    11,495   232,828      11,942     5,605   146,054         -         -    10,000  
             Weighted-average                                                                                                      
              grant-date fair                                                                                                      
              value per share         $ 29.38   $ 22.38  $  19.50     $ 32.00    $31.94  $  33.81      $  -     $   -   $ 10.25   
             -----------------------------------------------------------------------------------------------------------------------


                Stock options represent the right to purchase shares of
             Marathon Stock, Steel Stock or Delhi Stock at the market value of
             the stock at date of grant. Certain options contain the right to
             receive cash and/or common stock equal to the excess of the fair
             market value of shares of common stock, as determined in accordance
             with the plan, over the option price of shares. Stock options
             expire 10 years from the date they are granted and vest over a one-
             year service period.

                The following is a summary of stock option activity:


                                               Marathon Stock             Steel Stock               Delhi Stock
                                          ------------------------  ------------------------  -----------------------
                                            Shares     Price/(a)/      Shares     Price/(a)/   Shares      Price/(a)/
             -----------------------------------------------------------------------------------------------------------------------
                                                                                               
             Balance December 31, 1994     5,178,350        $24.44      720,300    $   37.27  192,800           $17.50
             Granted                         577,950         19.45      361,750        31.97   67,100            12.63
             Exercised                       (22,700)        17.66       (8,680)       21.87        -                - 
             Canceled                       (677,050)        26.44      (16,720)       31.03        -                -
                                          ----------                  ---------               -------                 
             Balance December 31, 1995     5,056,550         23.63    1,056,650        35.68  259,900            16.24
             Granted                         633,825         22.38      411,705        31.94   77,550            13.63
             Exercised                      (321,985)        17.50     (100,260)       31.98   (1,500)           12.69
             Canceled                       (137,820)        26.82      (22,500)       33.43   (9,000)           17.49
                                          ----------                  ---------               -------                 
             Balance December 31, 1996     5,230,570         23.78    1,345,595        34.85  326,950            15.60
             Granted                         756,260         29.38      457,590        32.00   94,250            13.31
             Exercised                    (2,215,665)        23.86     (158,265)       31.85   (6,300)           12.21
             Canceled                        (76,300)        26.91      (11,820)       34.36   (6,650)           15.73
                                          ----------                  ---------               -------                  
             Balance December 31, 1997     3,694,865         24.81    1,633,100        34.35  408,250 /(b)/      15.13
             -----------------------------------------------------------------------------------------------------------------------


             /(a)/ Weighted-average exercise price.
             /(b)/ Redeemed on January 26, 1998.

                     The following table represents stock options at December
             31, 1997, excluding the Delhi Stock, which was redeemed on January
             26, 1998:



                                                              Outstanding                         Exercisable
                                                -----------------------------------------   -----------------------
                                                                Weighted-                                             
                                                   Number        Average        Weighted-      Number     Weighted-                 
                                Range of         of Shares      Remaining       Average      of Shares      Average      
                                Exercise           Under       Contractual      Exercise       Under       Exercise      
                                 Prices           Option          Life           Price        Option         Price       
             -----------------------------------------------------------------------------------------------------------------------
                                                                                                          
             Marathon Stock    $17.00-23.44      1,806,455       6.7 years          $20.66     1,806,455       $20.66      
                                25.38-26.88        344,250       2.4                 25.81       344,250        25.81      
                                29.08-29.88      1,544,160       5.6                 29.43       789,200        29.49      
                                                 ---------                                     ---------                   
                               Total             3,694,865                                     2,939,905                   
                                                 ---------                                     ---------                   
             Steel Stock       $22.24-25.44         40,615       3.4 years          $24.70        40,615       $24.70      
                                31.69-34.44      1,309,310       8.2                 32.52       855,220        32.79      
                                      44.19        283,175       5.4                 44.19       283,175        44.19      
                                                 ---------                                     ---------                   
                               Total             1,633,100                                     1,179,010                    
             -----------------------------------------------------------------------------------------------------------------------

 
                 During 1996, USX adopted SFAS No. 123, Accounting for
             Stock-Based Compensation, as discussed in Note 2, and elected to
             continue to follow the accounting provisions of APB No. 25. Actual
             stock-based compensation expense was $30 million in 1997, $8
             million in 1996 and $3 million in 1995. Incremental compensation
             expense, as determined under SFAS No. 123, was not material ($.02
             or less per share for all years presented). Therefore, pro forma
             net income and earnings per share data have been omitted.

                 Effective January 1, 1997, USX created a deferred compensation
             plan for non-employee directors of its Board of Directors. The plan
             permits participants to defer some or all of their annual retainers
             in the form of common stock units or cash. Common stock units are
             book entry units equal in value to a share of Marathon Stock or
             Steel Stock. Deferred stock benefits are distributed in shares of
             common stock within five business days after a participant leaves
             the Board of Directors. During 1997, no shares of common stock were
             distributed.

                                                                            U-21

 
________________________________________________________________________________
22. DIVIDENDS

                In accordance with the USX Certificate of Incorporation,
             dividends on the Marathon Stock and Steel Stock are limited to the
             legally available funds of USX. Net losses of any Group, as well as
             dividends and distributions on any class of USX Common Stock or
             series of preferred stock and repurchases of any class of USX
             Common Stock or series of preferred stock at prices in excess of
             par or stated value, will reduce the funds of USX legally available
             for payment of dividends on all classes of Common Stock. Subject to
             this limitation, the Board of Directors intends to declare and pay
             dividends on the Marathon Stock and Steel Stock based on the
             financial condition and results of operations of the related group,
             although it has no obligation under Delaware law to do so. In
             making its dividend decisions with respect to each of the Marathon
             Stock and Steel Stock, the Board of Directors considers, among
             other things, the long-term earnings and cash flow capabilities of
             the related group as well as the dividend policies of similar
             publicly traded companies.

                Dividends on the Steel Stock are further limited to the
             Available Steel Dividend Amount. At December 31, 1997, the
             Available Steel Dividend Amount was at least $3,028 million. The
             Available Steel Dividend Amount will be increased or decreased, as
             appropriate, to reflect U. S. Steel Group net income, dividends,
             repurchases or issuances with respect to the Steel Stock and
             preferred stock attributed to the U. S. Steel Group and certain
             other items.

________________________________________________________________________________
23. STOCKHOLDER RIGHTS PLAN

                USX's Board of Directors has adopted a Stockholder Rights Plan
             and declared a dividend distribution of one right for each
             outstanding share of Marathon Stock and Steel Stock referred to
             together as "Voting Stock." Each right becomes exercisable, at a
             price of $120, when any person or group has acquired, obtained the
             right to acquire or made a tender or exchange offer for 15% or more
             of the total voting power of the Voting Stock, except pursuant to a
             qualifying all-cash tender offer for all outstanding shares of
             Voting Stock, which is accepted with respect to shares of Voting
             Stock representing a majority of the voting power other than Voting
             Stock beneficially owned by the offeror. Each right entitles the
             holder, other than the acquiring person or group, to purchase one
             one-hundredth of a share of Series A Junior Preferred Stock or,
             upon the acquisition by any person of 15% or more of the total
             voting power of the Voting Stock, Marathon Stock or Steel Stock (as
             the case may be) or other property having a market value of twice
             the exercise price. After the rights become exercisable, if USX is
             acquired in a merger or other business combination where it is not
             the survivor, or if 50% or more of USX's assets, earnings power or
             cash flow are sold or transferred, each right entitles the holder
             to purchase common stock of the acquiring entity having a market
             value of twice the exercise price. The rights and exercise price
             are subject to adjustment, and the rights expire on October 9,
             1999, or may be redeemed by USX for one cent per right at any time
             prior to the point they become exercisable. Under certain
             circumstances, the Board of Directors has the option to exchange
             one share of the respective class of Voting Stock for each
             exercisable right.

________________________________________________________________________________
24. INCOME PER COMMON SHARE

                The method of calculating net income (loss) per share for the
             Marathon Stock, the Steel Stock and, prior to November 1, 1997, the
             Delhi Stock reflects the USX Board of Directors' intent that the
             separately reported earnings and surplus of the Marathon Group, the
             U. S. Steel Group and the Delhi Group, as determined consistent
             with the USX Certificate of Incorporation, are available for
             payment of dividends on the respective classes of stock, although
             legally available funds and liquidation preferences of these
             classes of stock do not necessarily correspond with these amounts.
             The financial statements of the Marathon Group, the U. S. Steel
             Group and the Delhi Group, taken together, include all accounts
             which comprise the corresponding consolidated financial statements
             of USX.

                The USX Board of Directors, prior to June 15, 1995, had
             designated 14,003,205 shares of Delhi Stock to represent 100% of
             the common stockholders' equity value of USX attributable to the
             Delhi Group. The Delhi Fraction was the percentage interest in the
             Delhi Group represented by the shares of Delhi Stock that were
             outstanding at any particular time and, based on 9,438,391
             outstanding shares at June 14, 1995, was approximately 67%. The
             Marathon Group financial statements reflected a percentage interest
             in the Delhi Group of approximately 33% (Retained Interest) through
             June 14, 1995. On June 15, 1995, USX eliminated the Marathon
             Group's Retained Interest in the Delhi Group (equivalent to
             4,564,814 shares of Delhi Stock). This was accomplished through a
             reallocation of assets and a corresponding adjustment to debt and
             equity attributed to the Marathon and Delhi Groups. The
             reallocation was made at a price of $12.75 per equivalent share of
             Delhi Stock, or an aggregate of $58 million, resulting in a
             corresponding reduction of the Marathon Group debt.

                Basic net income (loss) per share is calculated by adjusting net
             income (loss) for dividend requirements of preferred stock and the
             noncash credit on exchange of preferred stock and, in the case of
             Delhi Stock, for the income applicable to the Retained Interest
             prior to June 15, 1995; and is based on the weighted average number
             of common shares outstanding.

                Diluted net income (loss) per share assumes conversion of
             convertible securities for the applicable periods outstanding and
             assumes exercise of stock options, provided in each case, the
             effect is not antidilutive.

U-22

 


                                                         COMPUTATION OF INCOME PER SHARE
                                                                       1997                  1996                  1995
                                                                 -------------------   ------------------   ------------------
                                                                  Basic     Diluted     Basic    Diluted     Basic     Diluted 
- ------------------------------------------------------------------------------------------------------------------------------
                                                                                                    
     CONTINUING OPERATIONS                                                                                                    
     MARATHON GROUP                                                                                                           
     --------------
     Net income (loss) (millions):                                                                                            
      Income (loss) before extraordinary loss                   $    456   $    456  $    671   $    671   $    (83)  $    (83)
      Dividends on preferred stock                                  -          -         -          -            (4)        (4)
      Extraordinary loss                                            -          -           (7)        (7)        (5)        (5)
                                                                --------   --------  --------   --------   --------   -------- 
      Net income (loss) applicable to Marathon Stock                 456        456       664        664        (92)       (92)
      Effect of dilutive securities                                                                                           
       Convertible debentures                                       -             3      -            14       -          -    
                                                                --------   --------  --------   --------   --------   -------- 
         Net income (loss) assuming conversions                 $    456   $    459  $    664   $    678   $    (92)  $    (92)
                                                                ========   ========  ========   ========   ========   ========  
     Shares of common stock outstanding (thousands):                                                                          
      Average number of common shares outstanding                288,038    288,038   287,460    287,460    287,271    287,271
      Effect of dilutive securities:                                                                                          
       Convertible debentures                                       -         1,936      -         8,975       -          -   
       Stock options                                                -           546      -           133       -          -   
                                                                --------   --------  --------   --------   --------   --------  
         Average common shares and dilutive effect               288,038    290,520   287,460    296,568    287,271    287,271
                                                                ========   ========  ========   ========   ========   ======== 
     Per share:                                                                                                               
      Income (loss) before extraordinary loss                   $   1.59   $   1.58  $   2.33   $   2.31   $   (.31)  $   (.31)
      Extraordinary loss                                             -          -        (.02)      (.02)      (.02)      (.02)
                                                                --------   --------  --------   --------   --------   --------  
      Net income (loss)                                         $   1.59   $   1.58  $   2.31   $   2.29   $   (.33)  $   (.33)
     -------------------------------------------------------------------------------------------------------------------------
     U. S. STEEL GROUP                                                                                                        
     -----------------                                                                                                        
     Net income (millions):                                                                                                   
      Income before extraordinary loss                          $    452   $    452  $    275   $    275   $    303   $    303
      Dividends on preferred stock                                   (13)      -          (22)       (22)       (24)       (24)
      Noncash credit from exchange of preferred stock                 10       -        -           -         -          -    
      Extraordinary loss                                            -          -           (2)        (2)        (2)        (2)
                                                                --------   --------  --------   --------   --------   --------  
      Net income applicable to Steel Stock                           449        452       251        251        277        277
      Effect of dilutive securities:                                                                                          
       Trust preferred securities                                   -             6     -           -         -          -     
       Preferred stock                                              -          -        -           -         -             22
       Convertible debentures                                       -             2     -              3      -              6
                                                                --------   --------  --------   --------   --------   -------- 
         Net income assuming conversions                        $    449   $    460  $    251   $    254   $    277   $    305
                                                                ========   ========  ========   ========   ========   ======== 
     Shares of common stock outstanding (thousands):                                                                          
      Average number of common shares outstanding                 85,672     85,672    84,025     84,025     79,064     79,064
      Effect of dilutive securities:                                                                                          
       Trust preferred securities                                   -         2,660      -          -          -         -     
       Preferred stock                                              -         4,811      -          -          -         7,480
       Convertible debentures                                       -         1,025      -         1,925       -         2,814
       Stock options                                                -            35      -            12       -            21
                                                                --------   --------  --------   --------   --------   -------- 
         Average common shares and dilutive effect                85,672     94,203    84,025     85,962     79,064     89,379
                                                                ========   ========  ========   ========   ========   ======== 
     Per Share:                                                                                                               
      Income before extraordinary loss                          $   5.24   $   4.88  $   3.00   $   2.97   $   3.53   $   3.43
      Extraordinary loss                                            -          -         (.02)      (.02)      (.02)      (.02)
                                                                --------   --------  --------   --------   --------   --------  
      Net income                                                $   5.24   $   4.88  $   2.98   $   2.95   $   3.51   $   3.41
     -------------------------------------------------------------------------------------------------------------------------
     DISCONTINUED OPERATIONS                                                                                                  
     DELHI GROUP                                                                                                              
     -----------                                                                                                              
     Net income (millions):                                                                                                   
      Income before extraordinary loss                          $   79.7   $   79.7  $    6.4   $    6.4   $    4.0   $    4.0
      Dividends on preferred stock                                  -          -         -          -           (.2)       (.2)
      Net income applicable to Retained Interest                    -          -         -          -          (2.4)      (2.4)
      Extraordinary loss                                            -          -          (.5)       (.5)       (.3)       (.3)
                                                                --------   --------  --------   --------   --------   --------  
         Net income applicable to outstanding                                                                                 
         Delhi Stock                                            $   79.7   $   79.7  $    5.9   $    5.9   $    1.1   $    1.1
                                                                ========   ========  ========   ========   ========   ======== 
     Shares of common stock outstanding (thousands):                                                                          
      Average number of common shares outstanding                  9,449      9,449     9,448      9,448      9,442      9,442
      Stock options                                                 -            21      -             3       -          -   
                                                                --------   --------  --------   --------   --------   --------  
         Average common shares and dilutive effect                 9,449      9,470     9,448      9,451      9,442      9,442
                                                                ========   ========  ========   ========   ========   ======== 
     Per share applicable to outstanding Delhi Stock:                                                                         
      Income before extraordinary loss                          $   8.43   $   8.41  $    .67   $    .67   $    .15   $    .15
      Extraordinary loss                                            -          -         (.06)      (.06)      (.03)      (.03)
                                                                --------   --------  --------   --------   --------   --------  
      Net income                                                $   8.43   $   8.41  $    .61   $    .61   $    .12   $    .12 
     -------------------------------------------------------------------------------------------------------------------------


                                                                            U-23

 
________________________________________________________________________________
25. PREFERRED STOCK OF SUBSIDIARY

             USX Capital LLC, a wholly owned subsidiary of USX, sold
             10,000,000 shares (carrying value of $250 million) of 8 3/4%
             Cumulative Monthly Income Preferred Shares (MIPS) (liquidation
             preference of $25 per share) in 1994. Proceeds of the issue were
             loaned to USX. USX has the right under the loan agreement to extend
             interest payment periods for up to 18 months, and as a consequence,
             monthly dividend payments on the MIPS can be deferred by USX
             Capital LLC during any such interest payment period. In the event
             that USX exercises this right, USX may not declare dividends on any
             share of its preferred or common stocks. The MIPS are redeemable at
             the option of USX Capital LLC and subject to the prior consent of
             USX, in whole or in part from time to time, for $25 per share on or
             after March 31, 1999, and will be redeemed from the proceeds of any
             repayment of the loan by USX. In addition, upon final maturity of
             the loan, USX Capital LLC is required to redeem the MIPS. The
             financial costs are included in net interest and other financial
             costs.

________________________________________________________________________________
26. USX OBLIGATED MANDATORILY REDEEMABLE CONVERTIBLE PREFERRED SECURITIES OF A
SUBSIDIARY TRUST

             In 1997, USX exchanged approximately 3.9 million 6.75% Convertible
             Quarterly Income Preferred Securities (Trust Preferred Securities)
             of USX Capital Trust I, a Delaware statutory business trust
             (Trust), for an equivalent number of shares of its 6.50% Cumulative
             Convertible Preferred Stock (6.50% Preferred Stock) (Exchange). The
             Exchange resulted in the recording of Trust Preferred Securities at
             a fair value of $182 million and a noncash credit to Retained
             Earnings of $10 million.

                USX owns all of the common securities of the Trust, which was
             formed for the purpose of the Exchange. (The Trust Common
             Securities and the Trust Preferred Securities are together referred
             to as the Trust Securities.) The Trust Securities represent
             undivided beneficial ownership interests in the assets of the
             Trust, which consist solely of USX 6.75% Convertible Junior
             Subordinated Debentures maturing March 31, 2037 (Debentures),
             having an aggregate principal amount equal to the aggregate initial
             liquidation amount ($50.00 per security and $203 million in total)
             of the Trust Securities issued by the Trust. Interest and principal
             payments on the Debentures will be used to make quarterly
             distributions and to pay redemption and liquidation amounts on the
             Trust Preferred Securities. The quarterly distributions, which
             accumulate at the rate of 6.75% per annum on the Trust Preferred
             Securities and the accretion from fair value to the initial
             liquidation amount, are charged to income and included in net
             interest and other financial costs.

                Under the terms of the Debentures, USX has the right to defer
             payment of interest for up to 20 consecutive quarters and, as a
             consequence, monthly distributions on the Trust Preferred
             Securities will be deferred during such period. If USX exercises
             this right, then, subject to limited exceptions, it may not pay any
             dividend or make any distribution with respect to any shares of its
             capital stock.

                The Trust Preferred Securities are convertible at any time prior
             to the close of business on March 31, 2037 (unless such right is
             terminated earlier under certain circumstances) at the option of
             the holder, into shares of Steel Stock at a conversion price of
             $46.25 per share of Steel Stock (equivalent to a conversion ratio
             of 1.081 shares of Steel Stock for each Trust Preferred Security),
             subject to adjustment in certain circumstances.

                The Trust Preferred Securities may be redeemed at any time at
             the option of USX, initially at a premium of 103.90% of the initial
             liquidation amount through March 31, 1998, and thereafter,
             declining annually to the initial liquidation amount on April 1,
             2003, and thereafter. They are mandatorily redeemable at March 31,
             2037, or earlier under certain circumstances.

                Payments related to quarterly distributions and to the payment
             of redemption and liquidation amounts on the Trust Preferred
             Securities by the Trust are guaranteed by USX on a subordinated
             basis. In addition, USX unconditionally guarantees the Trust's
             Debentures. The obligations of USX under the Debentures, and the
             related indenture, trust agreement and guarantee constitute a full
             and unconditional guarantee by USX of the Trust's obligations under
             the Trust Preferred Securities.

________________________________________________________________________________
27. PREFERRED STOCK

             USX is authorized to issue 40,000,000 shares of preferred stock,
             without par value-

             6.50% CUMULATIVE CONVERTIBLE PREFERRED STOCK (6.50% PREFERRED
             STOCK)-As of December 31, 1997, 2,962,037 shares (stated value of
             $1.00 per share; liquidation preference of $50.00 per share) were
             outstanding. The 6.50% Preferred Stock is convertible at any time,
             at the option of the holder, into shares of Steel Stock at a
             conversion price of $46.125 per share of Steel Stock, subject to
             adjustment in certain circumstances. This stock is redeemable at
             USX's sole option, at a price of $51.95 per share beginning April
             1, 1997, and thereafter at prices declining annually on each April
             1 to an amount equal to $50.00 per share on and after April 1,
             2003. In 1997, USX exchanged approximately 3.9 million shares of
             its 6.50% Preferred Stock for an equivalent number of shares of its
             Trust Preferred Securities.

U-24

 
________________________________________________________________________________
28. DERIVATIVE INSTRUMENTS

             USX uses commodity-based derivative instruments to manage exposure
             to price fluctuations related to the anticipated purchase or
             production and sale of crude oil, natural gas, refined products,
             nonferrous metals and electricity. The derivative instruments used,
             as a part of an overall risk management program, include exchange-
             traded futures contracts and options, and instruments which require
             settlement in cash such as OTC commodity swaps and OTC options.
             While risk management activities generally reduce market risk
             exposure due to unfavorable commodity price changes for raw
             material purchases and products sold, such activities can also
             encompass strategies which assume certain price risk in isolated
             transactions.

                USX uses forward currency contracts to eliminate the exposure to
             currency price fluctuations relating to Swiss franc debt
             obligations. The forward currency contracts effectively fix the
             principal and interest payments in U.S. dollars at the time of
             maturity.

                USX remains at risk for possible changes in the market value of
             the derivative instrument; however, such risk should be mitigated
             by price changes in the underlying hedged item. USX is also exposed
             to credit risk in the event of nonperformance by counterparties.
             The credit worthiness of counterparties is subject to continuing
             review, including the use of master netting agreements to the
             extent practical, and full performance is anticipated.

                The following table sets forth quantitative information by class
             of derivative instrument:



                                                         FAIR                 CARRYING        RECORDED                        
                                                         VALUE                 AMOUNT         DEFERRED       AGGREGATE        
                                                        ASSETS                 ASSETS          GAIN OR        CONTRACT        
             (In millions)                         (LIABILITIES)/(A)/      (LIABILITIES)        (LOSS)       VALUES/(B)/       
             -----------------------------------------------------------------------------------------------------------
                                                                                                    
             DECEMBER 31, 1997:
              Exchange-traded commodity futures      $     -                  $     -         $     -          $     30 
              Exchange-traded commodity options             1  /(c)/                 1               2              129 
              OTC commodity swaps/(d)/                     (3) /(e)/                (3)             (4)              50 
              OTC commodity options                        -                        -               -                 6 
                                                     ---------                ---------       ---------        ---------   
                Total commodities                    $     (2)                $     (2)       $     (2)        $    215 
                                                     ---------                ---------       ---------        ---------   
              Forward currency contract/(g)/:                                                                              
                   receivable                        $     11                 $     10        $     -                59 
                   payable                                 (1)                      (1)             (1)               5 
                                                     ---------                ---------       ---------        ---------    
                Total currencies                     $     10                 $      9        $     (1)        $     64  
             -----------------------------------------------------------------------------------------------------------  
             December 31, 1996: 
             Exchange-traded commodity futures       $    -                   $    -          $     (2)        $     49 
              Exchange-traded commodity options            (1) /(c)/                (1)             (2)             254 
              OTC commodity swaps                          (1) /(e)/                (2)             -                88 
              OTC commodity options                        (6) /(f)/                (6)             -                84 
                                                     ---------                ---------       ---------        ---------    
                Total commodities                    $     (8)                $     (9)       $     (4)        $    475 
                                                     ---------                ---------       ---------        ---------     
              Forward currency contract:                                                                                   
                 - receivable                        $     19                 $     16        $     -          $     59 
                 - payable                                 (1)                      (1)             (1)              10 
                                                     ---------                ---------       ---------        ---------     
                Total currencies                     $     18                 $     15        $     (1)        $     69  
             ----------------------------------------------------------------------------------------------------------- 
 

             /(a)/The fair value amounts for OTC positions are based on various
                  indices or dealer quotes. The fair value amounts for currency
                  contracts are based on dealer quotes of forward prices
                  covering the remaining duration of the foreign exchange
                  contract. The exchange-traded futures contracts and certain
                  option contracts do not have a corresponding fair value since
                  changes in the market prices are settled on a daily basis.
             /(b)/Contract or notional amounts do not quantify risk exposure,
                  but are used in the calculation of cash settlements under the
                  contracts. The contract or notional amounts do not reflect the
                  extent to which positions may offset one another.
             /(c)/Includes fair values as of December 31, 1997 and 1996, for
                  assets of $3 million and $1 million and for liabilities of
                  $(2) million and $(2) million, respectively.
             /(d)/The OTC swap arrangements vary in duration with certain
                  contracts extending into mid 2000.
             /(e)/Includes fair values as of December 31, 1997 and 1996, for
                  assets of $1 million and $3 million and for liabilities of
                  $(4) million and $(4) million, respectively.
             /(f)/Includes fair values as of December 31, 1996, for assets of $1
                  million and for liabilities of $(7) million.
             /(g)/The forward currency contract matures in 1998.

                                                                            U-25

 
________________________________________________________________________________
29. FAIR VALUE OF FINANCIAL INSTRUMENTS

             Fair value of the financial instruments disclosed herein is not
             necessarily representative of the amount that could be realized or
             settled, nor does the fair value amount consider the tax
             consequences of realization or settlement. The following table
             summarizes financial instruments, excluding derivative financial
             instruments disclosed in Note 28, by individual balance sheet
             account:



                                                                               1997                 1996
                                                                       --------------------  -------------------
                                                                         FAIR     CARRYING     Fair     Carrying   
             (In millions)               December 31                    VALUE      AMOUNT     Value      Amount    
             ---------------------------------------------------------------------------------------------------
                                                                                                  
             FINANCIAL ASSETS:                                                                                     
              Cash and cash equivalents                                 $   54      $   54    $   55      $   55   
              Receivables                                                1,417       1,417     1,270       1,270   
              Investments and long-term receivables                        177         120       252         211   
                                                                        ------      ------    ------    --------   
                Total financial assets                                  $1,648      $1,591    $1,577      $1,536   
             ---------------------------------------------------------------------------------------------------
             FINANCIAL LIABILITIES:                                                                                
              Notes payable                                             $  121      $  121    $   81      $   81   
              Accounts payable                                           2,011       2,011     2,204       2,204   
              Accrued interest                                              95          95       102         102   
              Long-term debt (including amounts due within one year)     3,646       3,281     4,332       4,083   
              Trust preferred securities and preferred                                                             
               stock of subsidiary                                         435         432       254         250   
                                                                        ------      ------    ------    --------   
                Total financial liabilities                             $6,308      $5,940    $6,973      $6,720    
             ---------------------------------------------------------------------------------------------------


                Fair value of financial instruments classified as current assets
             or liabilities approximates carrying value due to the short-term
             maturity of the instruments. Fair value of investments and long-
             term receivables was based on discounted cash flows or other
             specific instrument analysis. Fair value of trust preferred
             securities and preferred stock of subsidiary was based on market
             prices. Fair value of long-term debt instruments was based on
             market prices where available or current borrowing rates available
             for financings with similar terms and maturities.

                USX's unrecognized financial instruments consist of receivables
             sold and financial guarantees. It is not practicable to estimate
             the fair value of these forms of financial instrument obligations
             because there are no quoted market prices for transactions which
             are similar in nature. For details relating to sales of receivables
             see Note 13, and for details relating to financial guarantees see
             Note 30.

________________________________________________________________________________
30. CONTINGENCIES AND COMMITMENTS

                USX is the subject of, or party to, a number of pending or
             threatened legal actions, contingencies and commitments involving a
             variety of matters, including laws and regulations relating to the
             environment. Certain of these matters are discussed below. The
             ultimate resolution of these contingencies could, individually or
             in the aggregate, be material to the consolidated financial
             statements. However, management believes that USX will remain a
             viable and competitive enterprise even though it is possible that
             these contingencies could be resolved unfavorably.

             ENVIRONMENTAL MATTERS

                USX is subject to federal, state, local and foreign laws and
             regulations relating to the environment. These laws generally
             provide for control of pollutants released into the environment and
             require responsible parties to undertake remediation of hazardous
             waste disposal sites. Penalties may be imposed for noncompliance.
             At December 31, 1997, and December 31, 1996, accrued liabilities
             for remediation totaled $158 million and $144 million,
             respectively. It is not presently possible to estimate the ultimate
             amount of all remediation costs that might be incurred or the
             penalties that may be imposed. Receivables for recoverable costs
             from certain states, under programs to assist companies in cleanup
             efforts related to underground storage tanks at retail marketing
             outlets, were $42 million at December 31, 1997, and $23 million at
             December 31, 1996.

                For a number of years, USX has made substantial capital
             expenditures to bring existing facilities into compliance with
             various laws relating to the environment. In 1997 and 1996, such
             capital expenditures totaled $134 million and $165 million,
             respectively. USX anticipates making additional such expenditures
             in the future; however, the exact amounts and timing of such
             expenditures are uncertain because of the continuing evolution of
             specific regulatory requirements.

                At December 31, 1997, and December 31, 1996, accrued liabilities
             for platform abandonment and dismantlement totaled $128 million and
             $118 million, respectively.

U-26

 
             GUARANTEES -

                Guarantees of the liabilities of affiliated entities by USX and
             its consolidated subsidiaries totaled $73 million at December 31,
             1997, and $80 million at December 31, 1996. In the event that any
             defaults of guaranteed liabilities occur, USX has access to its
             interest in the assets of most of the affiliates to reduce
             potential losses resulting from these guarantees. As of December
             31, 1997, the largest guarantee for a single affiliate was $23
             million.

                At December 31, 1997, and December 31, 1996, USX's pro rata
             share of obligations of LOOP LLC and various pipeline affiliates
             secured by throughput and deficiency agreements totaled $165
             million and $176 million, respectively. Under the agreements, USX
             is required to advance funds if the affiliates are unable to
             service debt. Any such advances are prepayments of future
             transportation charges.

             COMMITMENTS -

                At December 31, 1997, and December 31, 1996, contract
             commitments for capital expenditures for property, plant and
             equipment totaled $424 million and $526 million, respectively.

                USX entered into a 15-year take-or-pay arrangement in 1993,
             which requires USX to accept pulverized coal each month or pay a
             minimum monthly charge of approximately $1.3 million. Charges for
             deliveries of pulverized coal totaled $24 million in 1997 and $23
             million in 1996. If USX elects to terminate the contract early, a
             maximum termination payment of $114 million, which declines over
             the duration of the agreement, may be required.

                USX is a party to a transportation agreement with a subsidiary
             of Transtar, Inc. (Transtar), for Great Lakes shipments of raw
             materials required by steel operations. The agreement is in effect
             until March 15, 2000, and requires USX to pay, at a minimum,
             Transtar's annual fixed costs related to the agreement, including
             lease/charter costs, depreciation of owned vessels, dry dock fees
             and other administrative costs. Total transportation costs under
             the agreement were $77 million in 1997 and $72 million in 1996,
             including fixed costs of $20 million in both years. The fixed costs
             are expected to continue at approximately the same level over the
             duration of the agreement.

________________________________________________________________________________
31. SUBSEQUENT EVENT - BUSINESS COMBINATIONS

                On December 12, 1997, USX and Ashland Inc. (Ashland) signed
             definitive agreements to combine the major elements of their
             refining, marketing and transportation (RM&T) operations. Pursuant
             to those agreements, on January 1, 1998, USX transferred certain
             RM&T net assets to a new consolidated subsidiary, which was named
             Marathon Ashland Petroleum LLC (MAP). Also on January 1, 1998, USX
             acquired certain RM&T net assets from Ashland in exchange for a 38%
             interest in MAP. The acquisition will be accounted for under the
             purchase method of accounting. The purchase price was determined to
             be $1.9 billion, based upon an external valuation of the fair
             value. The change in USX's ownership interest in MAP resulted in a
             change in interest gain which will be recognized in the first
             quarter 1998.

                In connection with the formation of MAP, USX and Ashland entered
             into a Limited Liability Company Agreement dated January 1, 1998
             (the LLC Agreement). The LLC Agreement provides for an initial term
             of MAP expiring on December 31, 2022 (25 years from its formation).
             The term will automatically be extended for ten-year periods,
             unless a termination notice is given by either party.

                Also in connection with the formation of MAP, the parties
             entered into a Put/Call, Registration Rights and Standstill
             Agreement (the Put/Call Agreement). The Put/Call Agreement provides
             that at any time after December 31, 2004, Ashland will have the
             right to sell to USX all of Ashland's ownership interest in MAP,
             for an amount in cash and/or the Marathon Oil Company or USX debt
             or equity securities equal to the product of 85% (90% if equity
             securities are used) of the fair market value of MAP at that time,
             multiplied by Ashland's percentage interest in MAP. Payment could
             be made at closing, or at USX's option, in three equal annual
             installments, the first of which would be payable at closing. At
             any time after December 31, 2004, USX will have the right to
             purchase all of Ashland's ownership interests in MAP, for an amount
             in cash equal to the product of 115% of the fair market value of
             MAP at that time, multiplied by Ashland's percentage interest in
             MAP.

                                                                            U-27

 
                The following unaudited pro forma data for USX includes the
             results of operations for the Ashland RM&T net assets, giving
             effect to the acquisition as if it had been consummated at the
             beginning of the year presented. The pro forma data is based on
             historical information and does not necessarily reflect the actual
             results that would have occurred nor is it necessarily indicative
             of future results of operations.

 
 
             (In millions, except per share amounts)                   1997/(a)/
             -------------------------------------------------------------------
                                                                       
             Consolidated:
              Revenues                                               $29,288
              Net income                                                 987
             Net income per common share of Marathon Stock:
              Basic                                                     1.58
              Diluted                                                   1.57
             -------------------------------------------------------------------


             /(a)/  The USX data is based on a calendar year. Ashland data is
                    based on a twelve-month period ended September 30, 1997.

             /(b)/  Excluding the pro forma inventory market valuation
                    adjustment, pro forma net income would have been $1,150
                    million. Reported net income, excluding the reported
                    inventory market valuation adjustment, would have been
                    $1,167 million.


U-28

 
Selected Quarterly Financial Data (Unaudited)


 
                                                                            1997     
                                                  ------------------------------------------------------- 
(In millions, except per share data)               4TH QTR.      3RD QTR.          2ND QTR.    1ST QTR.  
- --------------------------------------------------------------------------------------------------------- 
                                                                                      
CONTINUING OPERATIONS                                                            
Revenues                                           $5,734      $ 5,657 (a)        $5,502 (a)   $5,695 (a)   
Income from operations                                346          557 (a)           436 (a)      366 (a)   
  Costs and expenses include:                                                    
   Inventory market valuation                                                    
     charges (credits)                                147          (41)               64          114        
Income before                                                                    
  extraordinary loss                                  190          308 (a)           215 (a)      195 (a)   
Net income:                                                                      
  Income from                                                                    
    continuing operations                          $  190       $  308             $ 215        $ 195        
  Income (loss) from                                                             
    discontinued operations                            81           (1)               (1)           1        
                                                   ------       ------             -----       ----------        
  NET INCOME                                       $  271       $  307             $ 214       $  196 
- ---------------------------------------------------------------------------------------------------------
MARATHON STOCK DATA:                                                             
- --------------------                                                             
Income before                                                                    
  extraordinary loss                                                             
  applicable to                                                                  
  Marathon Stock                                   $   38       $  192            $  118       $  108
   Per share: basic                                   .14          .66               .41          .37
              diluted                                 .13          .66               .41          .37
Dividends paid per share                              .19          .19               .19          .19
Price range of Marathon
 Stock(b):
     Low                                               29           28-15/16          25-5/8       23-3/4  
     High                                              38-7/8       38-3/16           31-1/8       28-1/2  
- ---------------------------------------------------------------------------------------------------------
STEEL STOCK DATA:
- ---------------------------
Income before
  extraordinary loss
  applicable to Steel Stock                        $  149       $  114            $  105        $  81     
    Per share: basic                                 1.74         1.32              1.23          .96     
               diluted                               1.64         1.25              1.06          .93     
Dividends paid per share                              .25          .25               .25          .25     
Price range of Steel                                                                                      
 Stock(b):                                                                                                
     Low                                               26-7/8       34-3/16           25-3/8       26-3/8 
     High                                              36-15/16     40-3/4            35-5/8       33-3/8 
- ---------------------------------------------------------------------------------------------------------
DISCONTINUED OPERATIONS                                                                                   
DELHI STOCK DATA:                                                                                         
- ---------------------------                                                                               
Income (loss) before                                                                                      
  extraordinary loss                                                                                      
  applicable to Delhi Stock                        $   81 (c)    $  (1)           $   (1)       $   1     
   Per share:                basic                   8.51 (c)     (.06)             (.16)         .15     
              diluted                                8.46 (c)     (.06)             (.16)         .15     
Dividends paid per share                                -          .05               .05          .05     
Price range of Delhi                                                                                      
 Stock(b):                                                                                                
     Low                                               14-7/8       12-1/8            12-1/4       13     
     High                                              20-5/8       15-1/2            14-3/8       17     
- ---------------------------------------------------------------------------------------------------------

 
                                                                            1996
                                                   --------------------------------------------------------    
(In millions, except per share data)               4TH QTR.      3RD QTR.          2ND QTR.    1ST QTR.   
- -----------------------------------------------------------------------------------------------------------
                                                                                       
CONTINUING OPERATIONS
Revenues                                           $6,226 (a)  $5,809 (a)         $5,706 (a)   $5,236 (a) 
Income from operations                                527 (a)     448 (a)            308 (a)      496 (a)
  Costs and expenses include:
   Inventory market valuation
     charges (credits)                                (30)        (96)                72         (155)
Income before
  extraordinary loss                                  294 (a)     234 (a)            156 (a)      262 (a)
Net income:
  Income from
    continuing operations                           $ 285       $ 234              $ 156        $ 262
  Income (loss) from                                                                                                        
    discontinued operations                             6          (1)                (2)           3
                                                   ------     -------             ------        -----         
  NET INCOME                                        $ 291       $ 233              $ 154        $ 265
- ---------------------------------------------------------------------------------------------------------
MARATHON STOCK DATA:
- --------------------
Income before
  extraordinary loss
  applicable to
  Marathon Stock                                    $ 167       $ 164              $ 124        $ 216
   Per share: basic                                   .58         .57                .43          .75
              diluted                                 .57         .57                .43          .74
Dividends paid per share                              .19         .17                .17          .17
Price range of Marathon
 Stock(b):
     Low                                               21-1/8     20                 19-1/8        17-1/4
     High                                              25-1/2     22-1/8             22-7/8        20-1/2
- ---------------------------------------------------------------------------------------------------------
STEEL STOCK DATA:
- ---------------------------
Income before
  extraordinary loss
  applicable to Steel Stock                         $ 122       $  64              $  27        $  40
    Per share: basic                                 1.43         .76                .32          .49
               diluted                               1.36         .75                .32          .48
Dividends paid per share                              .25         .25                .25          .25       
Price range of Steel
 Stock(b):
     Low                                               26-1/2      24-1/8             27-3/4       30
     High                                              32          29-5/8             35-7/8       37-7/8
- ---------------------------------------------------------------------------------------------------------
DISCONTINUED OPERATIONS
DELHI STOCK DATA:
- ---------------------------
Income (loss) before
  extraordinary loss
  applicable to Delhi Stock                         $   6       $  (1)             $  (1)       $   2
   Per share: basic                                   .68        (.14)              (.12)         .25
              diluted                                 .68        (.14)              (.12)         .25
Dividends paid per share                              .05         .05                .05          .05 
Price range of Delhi
 Stock(b):
     Low                                               12-1/8      11-1/2             11-3/8       10
     High                                              16-5/8      14-3/4             14-5/8       12-3/8
- ---------------------------------------------------------------------------------------------------------


(a) Reclassified to conform to current classifications and exclude discontinued
    operations see Note 3, to the USX consolidated financial statements.
(b) Composite tape.
(c) Represents one month of operations and gain on disposal of the Delhi
    Companies.

                                                                            U-29

 
Principal Unconsolidated Affiliates (Unaudited)


 
 
                                                           December 31, 1997
        Company                              Country           Ownership            Activity
- ---------------------------------------------------------------------------------------------------------------
                                                                        

CLAM Petroleum B.V.                          Netherlands           50%         Oil & Gas Production                                 

Double Eagle Steel Coating Company           United States         50%         Steel Processing                                     

Kenai LNG Corporation                        United States         30%         Natural Gas Liquification                            

LOCAP, Inc.                                  United States         37%         Pipeline & Storage Facilities                        

LOOP LLC                                     United States         32%         Offshore Oil Port                                    

Nautilus Pipeline Company, LLC               United States         24%         Natural Gas Transmission                             

PRO-TEC Coating Company                      United States         50%         Steel Processing                                     

RMI Titanium Company                         United States         27%         Titanium Metal Products                              

Sakhalin Energy Investment Company Ltd.      Russia                38%         Oil & Gas Development                                

Transtar, Inc.                               United States         46%         Transportation                                       

USS/Kobe Steel Company                       United States         50%         Steel Products                                       

USS-POSCO Industries                         United States         50%         Steel Processing                                     

Worthington Specialty Processing             United States         50%         Steel Processing 
- ---------------------------------------------------------------------------------------------------------------------   
 

Supplementary Information on Mineral Reserves (Unaudited)
MINERAL RESERVES (OTHER THAN OIL AND GAS)

 
 
                                          Reserves at December 31(a)                   Production
                                          ----------------------------        ---------------------------
(Million tons)                            1997       1996    1995               1997     1996     1995
- ---------------------------------------------------------------------------------------------------------
                                                                                    
Iron(b)                                   754.8      716.3   730.9               16.8    15.1     15.5
Coal(c)                                   798.8      859.5   862.8                7.5     7.1      7.5
- ---------------------------------------------------------------------------------------------------------
         

(a) Commercially recoverable reserves include demonstrated (measured and
    indicated) quantities which are expressed in recoverable net product tons.
(b) In 1997, iron ore reserves increased 55.3 million tons due to lease
    exchanges. In 1996, iron ore reserves increased .5 million tons due to
    changes in estimates of recoverable amounts.
(c) In 1997, coal reserves decreased 53.2 million tons due to a lease
    termination. In 1996, coal reserves increased 3.8 million tons after
    exploration and lease activity.



 
Supplementary Information on Oil and Gas Producing Activities (Unaudited)

 CAPITALIZED COSTS AND ACCUMULATED DEPRECIATION, DEPLETION AND AMORTIZATION

                                               United                     Other                      Equity
(In millions)   December 31                    States        Europe    International  Consolidated  Affiliates   Total
- -------------------------------------------------------------------------------------------------------------------------
                                                                                                 
1997                                                                                                                 
   Capitalized costs:                                                                                                   
   Proved properties                           $8,117        $4,384         $163          $12,664         $405    $13,069        
   Unproved properties                            335            68           75              478            4        482       
                                                ------      -------          ----          ------      -------    -------       
     Total                                      8,452        4,452           238           13,142          409     13,551       
                                                ------      -------          ----          ------      -------    -------       
   Accumulated depreciation,                                                                                                    
   depletion and amortization:                                                                                                  
   Proved properties                            4,915        2,517            76            7,508          127      7,635       
   Unproved properties                             86          -               4               90          -           90       
                                               ------       ------        ------          -------      -------    -------       
     Total                                      5,001        2,517            80            7,598          127      7,725       
                                               ------       ------        ------          -------      -------    -------       
  Net capitalized costs                        $3,451       $1,935          $158          $ 5,544         $282    $ 5,826        
- ------------------------------------------------------------------------------------------------------------------------- 
1996
  Capitalized costs:
   Proved properties                           $7,667       $4,304          $126          $12,097         $183    $12,280
   Unproved properties                            292           63            68              423           57        480
                                               ------       ------        ------          -------       ------     -------
     Total                                      7,959        4,367           194           12,520          240     12,760
                                               ------       ------        ------          -------       ------     -------
  Accumulated depreciation,
   depletion and amortization:
   Proved properties                            4,715        2,363            60            7,138          120      7,258
   Unproved properties                             81            2             5               88          -           88
                                               ------       ------        ------          -------       ------    -------
     Total                                      4,796        2,365            65            7,226          120      7,346
                                               ------       ------        ------          -------       ------    -------
   Net capitalized costs                       $3,163       $2,002          $129          $ 5,294         $120    $ 5,414
 ------------------------------------------------------------------------------------------------------------------------


U-30

 
Supplementary Information on Oil and Gas Producing Activities
(Unaudited) CONTINUED

RESULTS OF OPERATIONS FOR OIL AND GAS PRODUCING ACTIVITIES, EXCLUDING CORPORATE
OVERHEAD AND INTEREST COSTS(a)

 
 
                                                 United                  Other                        Equity
(In millions)                                    States     Europe   International   Consolidated   Affiliates    Total
- -----------------------------------------------------------------------------------------------------------------------
                                                                                                 
1997: Revenues:
       Sales(b)                                  $  581      $ 572         $  21        $ 1,174         $ 42    $ 1,216     
       Transfers                                    724          -            38            762            -        762     
                                                 ------      -----         -----        -------         ----    -------     
        Total revenues                            1,305        572            59          1,936           42      1,978     
      Expenses:                                                                                                          
       Production costs                            (337)      (162)          (12)          (511)         (15)      (526)    
       Exploration expenses                        (127)       (34)          (25)          (186)          (1)      (187)    
       Depreciation, depletion                                                                                           
        and amortization                           (300)      (130)          (16)          (446)          (8)      (454)    
       Other expenses                               (32)        (3)          (13)           (48)           -        (48)    
                                                 ------      -----         -----        -------         ----    -------     
        Total expenses                             (796)      (329)          (66)        (1,191)         (24)    (1,215)    
      Other production-related                                                                                           
        earnings(c)                                   -         28             1             29            1         30     
                                                 ------      -----         -----        -------         ----    -------     
      Results before income taxes                   509        271            (6)           774           19        793     
      Income taxes (credits)                        170         79             4            253            4        257     
                                                 ------      -----         -----        -------         ----    -------     
      Results of operations                      $  339      $ 192         $ (10)       $   521         $ 15    $   536    
- ----------------------------------------------------------------------------------------------------------------------- 
1996: Revenues:
      Sales(b)                                   $  451      $ 736         $  24        $ 1,211         $ 45    $ 1,256
      Transfers                                     858          -            43            901            -        901
                                                 ------      -----         -----        -------         ----    ------- 
        Total revenues                            1,309        736            67          2,112           45      2,157
      Expenses:
       Production costs(d)                         (340)      (202)          (12)          (554)         (14)      (568)
       Exploration expenses                         (97)       (24)          (24)          (145)          (3)      (148)
       Depreciation, depletion
        and amortization                           (302)      (160)          (14)          (476)         (12)      (488)
       Other expenses                               (31)        (5)          (15)           (51)           -        (51)
                                                 ------      -----         -----        -------         ----    -------
        Total expenses                             (770)      (391)          (65)        (1,226)         (29)    (1,255)
      Other production-related                            
        earnings(c)                                   1         28             -             29            1         30
                                                 ------      -----         -----        -------         ----    -------
      Results before income taxes                   540        373             2            915           17        932
      Income taxes (credits)                        192        115            (1)           306            7        313
                                                 ------      -----         -----        -------         ----    -------
      Results of operations                      $  348      $ 258         $   3        $   609         $ 10    $   619
- ----------------------------------------------------------------------------------------------------------------------- 
1995: Revenues:
       Sales(b)                                  $  395      $ 622         $  24        $ 1,041         $ 41    $ 1,082
       Transfers                                    706          -            84            790            -        790
                                                 ------      -----         -----        -------         ----    -------
        Total revenues                            1,101        622           108          1,831           41      1,872
      Expenses:                                           
       Production costs                            (305)      (219)          (23)          (547)         (15)      (562)
       Exploration expenses                         (68)       (37)          (39)          (144)          (2)      (146)
       Depreciation, depletion                            
        and amortization(e)                        (361)      (184)          (54)          (599)         (11)      (610)
       Other expenses                               (29)        (5)           (4)           (38)           -        (38)
                                                 ------      -----         -----        -------         ----    -------
        Total expenses                             (763)      (445)         (120)        (1,328)         (28)    (1,356)
      Other production-related
        earnings(c)                                   -         31             -             31            1         32
                                                 ------      -----         -----        -------         ----    -------
      Results before income taxes                   338        208           (12)           534           14        548
      Income taxes (credits)                        124         83            (5)           202            5        207
                                                 ------      -----         -----        -------         ----    -------
      Results of operations                      $  214      $ 125         $  (7)       $   332         $  9    $   341
- ----------------------------------------------------------------------------------------------------------------------- 

(a)  Includes the results of hedging gains and losses.  
(b)  Includes net gains and (losses) on asset dispositions, as of December 31,
     1997, 1996 and 1995, of $7 million, $25 million and $(2) million,
     respectively.
(c)  Includes revenues, net of associated costs, from third-party activities
     that are an integral part of USX's production operations. Third-party
     activities may include the processing and/or transportation of third-party
     production, and the purchase and subsequent resale of gas utilized in
     reservoir management.
(d)  Includes domestic production tax charges of $11 million relating to prior
     periods.
(e)  Excludes charges of $465 million related to impairment of long-lived
     assets.

                                                                            U-31

 
Supplementary Information on Oil and Gas Producing Activities
(Unaudited) CONTINUED 
COSTS INCURRED FOR PROPERTY ACQUISITION, EXPLORATION AND DEVELOPMENT INCLUDING
CAPITAL EXPENDITURES

 
 
                                                 United                      Other                       Equity
(In millions)                                    States       Europe     International  Consolidated   Affiliates    Total
- --------------------------------------------------------------------------------------------------------------------------
                                                                                                   
1997: Property acquisition:
       Proved                                    $   16       $   -      $        -     $       16     $     -       $  16
       Unproved                                      50           -               -             50           -          50
      Exploration                                   170           53              43           266           3         269
      Development                                   477           67              27           571         152         723
- -------------------------------------------------------------------------------------------------------------------------- 
1996: Property acquisition:
       Proved                                    $   36       $   -       $      -      $      36      $    -        $  36
       Unproved                                      44           -               2            46           19          65
      Exploration                                   134           26             34           194            1         195
      Development                                   268           31             15           314            3         317
- -------------------------------------------------------------------------------------------------------------------------- 
1995: Property acquisition:
       Proved                                    $   13       $   -       $       1     $      14      $    -         $ 14
       Unproved                                      24           -              -             24            5          29
      Exploration                                   100           42             52           194            1         195
      Development                                   223           44             37           304            8         312
- --------------------------------------------------------------------------------------------------------------------------


ESTIMATED QUANTITIES OF PROVED OIL AND GAS RESERVES

     The following estimates of net reserves have been determined by deducting
royalties of various kinds from USX's gross reserves. The reserve estimates are
believed to be reasonable and consistent with presently known physical data
concerning size and character of the reservoirs and are subject to change as
additional knowledge concerning the reservoirs becomes available. The estimates
include only such reserves as can reasonably be classified as proved; they do
not include reserves which may be found by extension of proved areas or reserves
recoverable by secondary or tertiary recovery methods unless these methods are
in operation and are showing successful results. Undeveloped reserves consist of
reserves to be recovered from future wells on undrilled acreage or from existing
wells where relatively major expenditures will be required to realize
production. Liquid hydrocarbon production amounts for international operations
principally reflect tanker liftings of equity production. USX did not have any
quantities of oil and gas reserves subject to long-term supply agreements with
foreign governments or authorities in which USX acts as producer.

 
 
                                                 United                      Other                       Equity
(Millions of barrels)                            States       Europe     International  Consolidated   Affiliates    Total
- -------------------------------------------------------------------------------------------------------------------------- 
                                                                                                   
Liquid Hydrocarbons
 Proved developed and undeveloped reserves:

  Beginning of year  1995                           553          211              31            795         -          795
  Purchase of reserves in place                       2           -               -               2         -            2
  Revisions of previous estimates                    (5)          (8)             (5)           (18)        -          (18)
  Improved recovery                                   4           -               -               4         -            4
  Extensions, discoveries and               
   other additions                                   67           -                3             70         -           70
  Production                                        (48)         (20)             (6)           (74)        -          (74)
  Sales of reserves in place                        (15)          -               -             (15)        -          (15)
                                                  -----         ----             ---           ----      -----       -----
  End of year  1995                                 558          183              23            764         -          764
  Purchase of reserves in place                      26           -               -              26         -           26
  Revisions of previous estimates                     3           (1)              3              5         -            5
  Improved recovery                                  19           -               -              19         -           19
  Extensions, discoveries and
   other additions                                   54           13              15             82         -           82
  Production                                        (45)         (18)             (3)           (66)        -          (66)
  Sales of reserves in place                        (26)          -              (12)           (38)        -          (38)
                                                  -----         ----             ---           ----      -----       ----- 
  End of year  1996                                 589          177              26            792         -          792
  Purchase of reserves in place                       2           -               -               2         -            2
  Revisions of previous estimates                     9           (1)              3             11         -           11
  Improved recovery                                  22           -               -              22         -           22
  Extensions, discoveries and
  other additions                                    31           -               -              31          82        113
  Production                                       (42)          (15)             (3)           (60)         -         (60)
  Sales of reserves in place                        (2)           -               -              (2)         -          (2)
                                                  -----         -----            ---           ----      ------      -----
  End of year  1997                                609            161             26            796          82        878
- --------------------------------------------------------------------------------------------------------------------------  
Proved developed reserves:
  Beginning of year  1995                         493            202              22            717          -         717
  End of year  1995                               470            182              21            673          -         673
  End of year  1996                               443            163              11            617          -         617
  End of year  1997                               486            161              12            659          -         659
- --------------------------------------------------------------------------------------------------------------------------  


U-32

 
                Supplementary Information on Oil and Gas Producing Activities
                (Unaudited) CONTINUED

                ESTIMATED QUANTITIES OF PROVED OIL AND GAS RESERVES (CONTINUED)

 
 
                                                               United                Other                        Equity
                (Billions of cubic feet)                       States   Europe   International   Consolidated   Affiliates   Total
                --------------------------------------------------------------------------------------------------------------------
                                                                                                            
                Natural Gas
                 Proved developed and undeveloped reserves:
                   Beginning of year - 1995                    2,127    1,484           43          3,654          153        3,807
                   Purchase of reserves in place                  24        -            -             24            -           24
                   Revisions of previous estimates               (17)     (12)          (3)           (32)          (7)         (39)
                   Improved recovery                               1        -            -              1            -            1
                   Extensions, discoveries and
                     other additions                             313       26            -            339            -          339
                   Production                                   (231)    (154)          (5)          (390)         (15)        (405)
                   Sales of reserves in place                     (7)       -            -             (7)           -           (7)
                                                               -----    -----         ----          -----         ----        -----
                   End of year - 1995                          2,210    1,344           35          3,589          131        3,720
                   Purchase of reserves in place                  10        -            -             10            -           10
                   Revisions of previous estimates               (27)      26          (14)           (15)           9           (6)
                   Improved recovery                              10        -            -             10            -           10
                   Extensions, discoveries and
                     other additions                             308        2            5            315            8          323
                   Production                                   (247)    (166)          (5)          (418)         (16)        (434)
                   Sales of reserves in place                    (25)     (28)           -            (53)           -          (53)
                                                               -----    -----         ----          -----         ----        -----
                   End of year - 1996                          2,239    1,178           21          3,438          132        3,570
                   Purchase of reserves in place                  31        -            -             31            -           31
                   Revisions of previous estimates               (39)       9            6            (24)          (6)         (30)
                   Improved recovery
                   Extensions, discoveries and
                     other additions                             262        -            -            262            -          262
                   Production                                   (264)    (139)          (4)          (407)         (15)        (422)
                   Sales of reserves in place                     (9)       -            -             (9)           -           (9)
                                                               -----    -----         ----          -----         ----        -----
                   End of year - 1997                          2,220    1,048           23          3,291          111        3,402
                --------------------------------------------------------------------------------------------------------------------
                Proved developed reserves:
                   Beginning of year - 1995                    1,442    1,436           41          2,919          104        3,023
                   End of year - 1995                          1,517    1,300           35          2,852          105        2,957
                   End of year - 1996                          1,720    1,133           16          2,869          100        2,969
                   End of year - 1997                          1,702    1,024           19          2,745           78        2,823
                --------------------------------------------------------------------------------------------------------------------


                STANDARDIZED MEASURE OF DISCOUNTED FUTURE NET CASH FLOWS AND
                CHANGES THEREIN RELATING TO PROVED OIL AND GAS RESERVES

                   Estimated discounted future net cash flows and changes
                therein were determined in accordance with Statement of
                Financial Accounting Standards No. 69. Certain information
                concerning the assumptions used in computing the valuation of
                proved reserves and their inherent limitations are discussed
                below. USX believes such information is essential for a proper
                understanding and assessment of the data presented.

                   Future cash inflows are computed by applying year-end prices
                of oil and gas relating to USX's proved reserves to the year-end
                quantities of those reserves. Future price changes are
                considered only to the extent provided by contractual
                arrangements in existence at year-end.

                   The assumptions used to compute the proved reserve valuation
                do not necessarily reflect USX's expectations of actual revenues
                to be derived from those reserves nor their present worth.
                Assigning monetary values to the estimated quantities of
                reserves, described on the preceding page, does not reduce the
                subjective and ever-changing nature of such reserve estimates.

                   Additional subjectivity occurs when determining present
                values because the rate of producing the reserves must be
                estimated. In addition to uncertainties inherent in predicting
                the future, variations from the expected production rate also
                could result directly or indirectly from factors outside of
                USX's control, such as unintentional delays in development,
                environmental concerns, changes in prices or regulatory
                controls.

                   The reserve valuation assumes that all reserves will be
                disposed of by production. However, if reserves are sold in
                place or subjected to participation by foreign governments,
                additional economic considerations also could affect the amount
                of cash eventually realized.

                   Future development and production costs, including
                abandonment and dismantlement costs, are computed by estimating
                the expenditures to be incurred in developing and producing the
                proved oil and gas reserves at the end of the year, based on
                year-end costs and assuming continuation of existing economic
                conditions.

                   Future income tax expenses are computed by applying the
                appropriate year-end statutory tax rates, with consideration of
                future tax rates already legislated, to the future pretax net
                cash flows relating to USX's proved oil and gas reserves.
                Permanent differences in oil and gas related tax credits and
                allowances are recognized.

                   Discount was derived by using a discount rate of 10 percent a
                year to reflect the timing of the future net cash flows relating
                to proved oil and gas reserves.

                                                                            U-33

 
                Supplementary Information on Oil and Gas Producing Activities
                (Unaudited) CONTINUED

                STANDARDIZED MEASURE OF DISCOUNTED FUTURE NET CASH FLOWS
                RELATING TO PROVED OIL AND GAS RESERVES (CONTINUED)

 
 
                                                United                      Other                           Equity                
                (In millions)                   States       Europe     International    Consolidated     Affiliates      Total   
                -----------------------------------------------------------------------------------------------------------------
                                                                                                           
                DECEMBER 31, 1997:
                Future cash inflows             $13,902      $ 6,189        $ 484              $20,575      $  1,714      $22,289   
                Future production costs          (4,739)      (2,310)        (172)              (7,221)         (643)      (7,864)  
                Future development costs           (702)        (162)         (18)                (882)         (200)      (1,082)  
                Future income tax expenses       (2,413)      (1,371)         (62)              (3,846)         (232)      (4,078)  
                                                -------      -------        -----              -------      --------      -------   
                Future net cash flows             6,048        2,346          232                8,626           639        9,265   
                10% annual discount for                                                                                             
                 estimated timing of cash flows  (2,696)      (1,011)         (52)              (3,759)         (367)      (4,126)  
                                                -------      -------        -----              -------      --------      -------   
                Standardized measure of                                                                                             
                discounted future net cash                                                                                          
                flows relating to proved oil                                                                                        
                and gas reserves                $ 3,352      $ 1,335        $ 180             $  4,867      $   272       $ 5,139   
                --------------------------------------------------------------------------------------------------------------------
                December 31, 1996:
                Future cash inflows             $19,640      $ 8,177        $ 631             $ 28,448      $    390      $28,838   
                Future production costs          (5,442)      (2,454)        (177)              (8,073)         (153)      (8,226)  
                Future development costs           (762)        (179)         (45)                (986)          (35)      (1,021)  
                Future income tax expenses       (4,151)      (2,256)        (115)              (6,522)          (78)      (6,600)  
                                                -------      -------        -----             --------      --------      -------   
                Future net cash flows             9,285        3,288          294               12,867           124       12,991   
                10% annual discount for                                                                                             
                 estimated timing of cash flows  (4,232)      (1,033)         (69)              (5,334)          (40)      (5,374)  
                                                -------      -------        -----              -------      --------      -------   
                Standardized measure of                                                                                             
                discounted future net cash                                                                                          
                flows relating to proved oil                                                                                        
                and gas reserves                $ 5,053      $ 2,255          225             $  7,533      $     84      $ 7,617   
                --------------------------------------------------------------------------------------------------------------------
                December 31, 1995:
                Future cash inflows             $12,944      $ 6,204        $ 460             $ 19,608      $    337      $19,945   
                Future production costs          (4,397)      (2,537)        (148)              (7,082)         (152)      (7,234)  
                Future development costs           (535)         (74)         (22)                (631)          (24)        (655)  
                Future income tax expenses       (2,253)        (901)         (86)              (3,240)          (57)      (3,297)  
                                                -------      -------        -----              -------      --------      -------   
                Future net cash flows             5,759        2,692          204                8,655           104        8,759   
                10% annual discount for                                                                                             
                 estimated timing of cash flows  (2,608)      (1,039)         (46)              (3,693)          (29)      (3,722)  
                                                -------      -------        -----              -------      --------      -------   
                Standardized measure of                                                                                             
                discounted future net cash                                                                                          
                flows relating to proved oil                                                                                        
                and gas reserves                $ 3,151      $ 1,653        $ 158             $  4,962       $    75      $ 5,037   
                --------------------------------------------------------------------------------------------------------------------
 

                SUMMARY OF CHANGES IN STANDARDIZED MEASURE OF DISCOUNTED FUTURE
                NET CASH FLOWS RELATING TO PROVED OIL AND GAS RESERVES

 
 
                                                 Consolidated                  Equity Affiliates                   Total          
                                         -----------------------------    ---------------------------   ----------------------------
          (In millions)                  1997       1996      1995         1997      1996    1995        1997      1996       1995 
          --------------------------------------------------------------------------------------------------------------------------
                                                                                                  
          Sales and transfers of                                                                                                   
           oil and gas produced,                                                                                                   
           net of production costs       $(1,424)  $(1,558)  $(1,285)       $ (28)   $(31)   $(26)    $(1,452)   $(1,589)   $(1,311)
          Net changes in prices and                                                                                                
           production costs related                                                                                                
           to future production           (3,677)    3,651        97          (36)     37       5      (3,713)     3,688        102
          Extensions, discoveries and                                                                                             
            improved recovery, less                                                                                               
            related costs                    458     1,572       852          263       9       -         721      1,581        852
          Development costs incurred                                                                                              
            during the period                571       314       304          152       3       8         723        317        312
          Changes in estimated future                                                                                              
            development costs               (302)     (316)      (56)        (138)    (10)     (8)       (440)      (326)       (64)
          Revisions of previous                                                                                                    
            quantity estimates                43        15      (117)          (5)      9      (5)         38         24       (122)
          Net changes in purchases                                                                                                 
            and sales of minerals                                                                                                  
            in place                          14       (58)      (39)           -       -       -          14        (58)       (39)
          Accretion of discount            1,065       658       624           13      11      19       1,078        669        643
          Net change in income taxes       1,350    (1,342)      186          (29)    (11)     (2)      1,321     (1,353)       184
          Other                             (764)     (365)     (180)          (4)     (8)     (2)       (768)      (373)      (182)
          --------------------------------------------------------------------------------------------------------------------------
          Net change for the year         (2,666)    2,571       386          188       9     (11)     (2,478)     2,580        375
          Beginning of year                7,533     4,962     4,576           84      75      86       7,617      5,037      4,662
          --------------------------------------------------------------------------------------------------------------------------
          End of year                     $4,867    $7,533    $4,962         $272    $ 84    $ 75     $ 5,139     $7,617     $5,037
          --------------------------------------------------------------------------------------------------------------------------
 

U-34

 
                Five-Year Operating Summary - Marathon Group



                                                                                     1997      1996      1995      1994      1993
                ------------------------------------------------------------------------------------------------------------------
                                                                                                               
                NET LIQUID HYDROCARBON PRODUCTION (thousands of barrels
                per day)
                 United States (by region)
                  Alaska                                                               -         8         9         9         9
                  Gulf Coast                                                          29        30        33        12        10
                  Southern                                                             8         9        11        12        12
                  Central                                                              5         4         8         9         9
                  Mid-Continent - Yates                                               25        25        24        23        22
                  Mid-Continent - Other                                               21        20        19        18        18
                  Rocky Mountain                                                      27        26        28        27        31
                                                                                  ------------------------------------------------
                       Total United States                                           115       122       132       110       111
                                                                                  ------------------------------------------------
                 International
                  Abu Dhabi                                                            -         -         -         1         2
                  Egypt                                                                8         8         5         7         6
                  Indonesia                                                            -         -        10         3         3
                  Norway                                                               2         3         2         2         2
                  Tunisia                                                              -         -         2         3         8
                  United Kingdom                                                      39        48        54        46        24
                                                                                  ------------------------------------------------
                       Total International                                            49        59        73        62        45
                                                                                  ------------------------------------------------
                        Total                                                        164       181       205       172       156
                  Natural gas liquids included in above                               17        17        17        15        14
                --------------------------------------------------------------------------------------------------------------------
                NET NATURAL GAS PRODUCTION (millions of cubic feet per day)
                 United States (by region)                                
                  Alaska                                                             151       145       133       123       116
                  Gulf Coast                                                          78        88        94        79        98
                  Southern                                                           189       161       142       134        94
                  Central                                                            119       109       105       110       107
                  Mid-Continent                                                      125       122       112        89        78
                  Rocky Mountain                                                      60        51        48        39        36
                                                                                  ------------------------------------------------
                    Total United States                                              722       676       634       574       529
                                                                                  ------------------------------------------------
                 International                                            
                  Egypt                                                               11        13        15        17        17
                  Ireland                                                            228       259       269       263       258
                  Norway                                                              54        87        81        81        75
                  United Kingdom - equity                                            130       140        98        39        23
                                 - other/(a)/                                         32        32        35        -         -
                                                                                  ------------------------------------------------
                    Total International                                              455       531       498       400       373
                                                                                  ------------------------------------------------
                     Consolidated                                                  1,177     1,207     1,132       974       902
                    Equity affiliate/(b)/                                             42        45        44        40        35
                                                                                  ------------------------------------------------
                     Total                                                         1,219     1,252     1,176     1,014       937
                ------------------------------------------------------------------------------------------------------------------ 
                AVERAGE SALES PRICES                                      
                 Liquid Hydrocarbons (dollars per barrel)/(c)/            
                  United States                                                   $16.88    $18.58    $14.59    $13.53    $14.54
                  International                                                    18.77     20.34     16.66     15.61     16.22
                 Natural Gas (dollars per thousand cubic feet)/(c)/               
                  United States                                                    $2.20     $2.09     $1.63     $1.94     $1.94
                  International                                                     2.00      1.97      1.80      1.58      1.52
                ------------------------------------------------------------------------------------------------------------------  
                NET PROVED RESERVES AT YEAR-END (developed and            
                 undeveloped)                                             
                 Liquid Hydrocarbons (millions of barrels)                
                  United States                                                      609       589       558       553       573
                  International                                                      187       203       206       242       269
                                                                                  ------------------------------------------------
                     Consolidated                                                    796       792       764       795       842
                  Equity affiliate/(d)/                                               82        -         -         -         -
                                                                                  ------------------------------------------------ 
                     Total                                                           878       792       764       795       842
                 Developed reserves as % of total net reserves                        75%       78%       88%       90%       88%
                ------------------------------------------------------------------------------------------------------------------  
                 Natural Gas (billions of cubic feet)                     
                  United States                                                    2,220     2,239     2,210     2,127     2,045
                  International                                                    1,071     1,199     1,379     1,527     1,703
                                                                                  ------------------------------------------------ 
                     Consolidated                                                  3,291     3,438     3,589     3,654     3,748
                  Equity affiliate/(b)/                                              111       132       131       153       153
                                                                                  ------------------------------------------------ 
                     Total                                                         3,402     3,570     3,720     3,807     3,901
                 Developed reserves as % of total net reserves                        83%       83%       80%       79%       80%
                ------------------------------------------------------------------------------------------------------------------

                /(a)/  Represents gas acquired for injection and subsequent
                       resale.
                /(b)/  Represents Marathon's equity interest in CLAM Petroleum
                       B.V.
                /(c)/  Prices exclude gains/losses from hedging activities.
                /(d)/  Represents Marathon's equity interest in Sakhalin Energy
                       Investment Company Ltd.

                                                                            U-35

 
                Five-Year Operating Summary  Marathon Group CONTINUED


                                                                        1997      1996      1995      1994      1993
             ---------------------------------------------------------------------------------------------------------   
                                                                                                     
             U.S. REFINERY OPERATIONS (thousands of
              barrels per day)
              In-use crude oil capacity at year-end                      575       570       570       570       570      
              Refinery runs - crude oil refined                          525       511       503       491       549      
                            - other charge and blend stocks               99        96        94       107       102      
              In-use crude oil capacity utilization rate                  92%       90%       88%       86%       90%     
             ---------------------------------------------------------------------------------------------------------     
             SOURCE OF CRUDE PROCESSED (thousands of                                                                      
              barrels per day)                                                                                            
              United States                                              202       229       254       218       299      
              Europe                                                      10        12         6        31         3      
              Middle East and Africa                                     241       193       183       171       173      
              Other International                                         72        79        58        70        75      
                                                                     -------------------------------------------------      
                 Total                                                   525       513       501       490       550      
             ---------------------------------------------------------------------------------------------------------     
             REFINED PRODUCT YIELDS (thousands of                                                                         
              barrels per day)                                                                                            
              Gasoline                                                   353       345       339       340       369      
              Distillates                                                154       155       146       146       157      
              Propane                                                     13        13        12        13        15      
              Feedstocks and special products                             36        35        38        33        33      
              Heavy fuel oil                                              35        30        31        38        39      
              Asphalt                                                     39        36        36        30        38      
                                                                     -------------------------------------------------      
                 Total                                                   630       614       602       600       651      
             ---------------------------------------------------------------------------------------------------------     
             REFINED PRODUCTS YIELDS (% breakdown)                                                                        
              Gasoline                                                    56%       56%       57%       57%       57%     
              Distillates                                                 24        25        24        24        24      
              Other products                                              20        19        19        19        19      
                                                                     -------------------------------------------------      
                 Total                                                   100%      100%      100%      100%      100%     
             ---------------------------------------------------------------------------------------------------------     
             U.S. REFINED PRODUCT SALES (thousands of                                                                     
              barrels per day)                                                                                            
              Gasoline                                                   452       468       445       443       420      
              Distillates                                                198       192       180       183       179      
              Propane                                                     12        12        12        16        18      
              Feedstocks and special products                             40        37        44        32        32      
              Heavy fuel oil                                              34        31        31        38        39      
              Asphalt                                                     39        35        35        31        38      
                                                                     -------------------------------------------------      
                 Total                                                   775       775       747       743       726      
              Matching buy/sell volumes included in above                 51        71        47        73        47      
             ---------------------------------------------------------------------------------------------------------     
             REFINED PRODUCTS SALES BY CLASS OF TRADE                                                                     
              (as a % of total sales)                                                                                     
              Wholesale - independent private-brand                                                                       
                          marketers and consumers                         61%       62%       61%       62%       63%     
              Retail    - Marathon brand outlets                          13        13        13        13        13      
                        - Emro Marketing Company outlets                  26        25        26        25        24      
                                                                     -------------------------------------------------      
                 Total                                                   100%      100%      100%      100%      100%     
             ---------------------------------------------------------------------------------------------------------     
             REFINED PRODUCTS (dollars per barrel)                                                                        
              Average sales price                                    $ 26.38   $ 27.43   $ 23.80   $ 22.75   $ 23.42      
              Average cost of crude oil throughput                     19.00     21.94     18.09     16.59     17.05      
             ---------------------------------------------------------------------------------------------------------     
             PETROLEUM INVENTORIES AT YEAR-END                                                                            
              (thousands of barrels)                                                                                      
              Crude oil and natural gas liquids                       18,660    19,325    21,598    21,892    21,689      
              Refined products                                        20,598    21,283    22,102    23,657    23,136      
             ---------------------------------------------------------------------------------------------------------     
             U.S. Refined Product Marketing Outlets at year-end
              Marathon operated terminals                                 51        51        51        51        51      
              Retail - Marathon brand                                  2,465     2,392     2,380     2,356     2,331      
                     - Emro Marketing Company                          1,544     1,592     1,627     1,659     1,571      
             ---------------------------------------------------------------------------------------------------------     
             PIPELINES (miles of common carrier                                                                           
              pipelines, including affiliates)                                                                            
              Crude Oil - gathering lines                              1,003     1,052     1,115     1,115     1,130      
                        - trunklines                                   2,552     2,552     2,553     2,559     2,581      
              Products  - trunklines                                   1,493     1,493     1,494     1,494     1,495      
                                                                     -------------------------------------------------      
                 Total                                                 5,048     5,097     5,162     5,168     5,206      
             ---------------------------------------------------------------------------------------------------------     
             PIPELINE BARRELS HANDLED (millions)                                                                          
              Crude Oil - gathering lines                               43.9      43.2      43.8      43.4      43.8      
                        - trunklines                                   369.6     378.7     371.3     353.0     382.4      
              Products  - trunklines                                   262.4     274.8     252.3     282.2     295.6      
                                                                     -------------------------------------------------      
                 Total                                                 675.9     696.7     667.4     678.6     721.8      
             ---------------------------------------------------------------------------------------------------------     
             CARNEGIE NATURAL GAS COMPANY STATISTICS                                                                      
              Miles of pipeline                                        1,794     1,787     1,800     1,799     1,810      
              Reserves dedicated to gathering                                                                             
               operations - owned                                                                                          
               (proved developed - billions of cubic feet)              39.8      42.8      44.3      43.8      46.7      
              Natural gas throughput (billions of cubic feet)           31.8      34.1      34.1      27.9      37.2      
             ---------------------------------------------------------------------------------------------------------   


U-36

 
             Five-Year Operating Summary - U. S. Steel Group



             (Thousands of net tons, unless otherwise noted)    1997          1996       1995      1994       1993
             -----------------------------------------------------------------------------------------------------
                                                                                                             
             RAW STEEL PRODUCTION                                                                                   
              Gary, IN                                         7,428         6,840      7,163     6,768      6,624  
              Mon Valley, PA                                   2,561         2,746      2,740     2,669      2,507  
              Fairfield, AL                                    2,361         1,862      2,260     2,240      2,203  
                                                              ----------------------------------------------------  
                Total                                         12,350        11,448     12,163    11,677     11,334  
             -----------------------------------------------------------------------------------------------------
             RAW STEEL CAPABILITY                                                                                   
              Continuous cast                                 12,800        12,800     12,500    11,990     11,850  
              Total production as % of                                                                              
              total capability                                  96.5          89.4       97.3      97.4       95.6  
             -----------------------------------------------------------------------------------------------------  
             HOT METAL PRODUCTION                             10,591         9,716     10,521    10,328      9,972  
             -----------------------------------------------------------------------------------------------------  
             COKE PRODUCTION                                   5,757/(a)/    6,777      6,770     6,777      6,425   
             -----------------------------------------------------------------------------------------------------  
             IRON ORE PELLETS MINNTAC, MN                                                                          
              Shipments                                       16,319        14,962     15,218    16,174     15,911  
             -----------------------------------------------------------------------------------------------------  
             COAL PRODUCTION                                                                                        
              Metallurgical coal/(b)/                          7,528         7,283      7,509     7,424      8,142  
              Steam coal/(b)(c)/                                   -             -          -         -      2,444  
                                                           -------------------------------------------------------
              Total                                            7,528         7,283      7,509     7,424     10,586  
             -----------------------------------------------------------------------------------------------------  
             COAL SHIPMENTS/(b)(c)/                            7,811         7,117      7,502     7,698     10,980  
             -----------------------------------------------------------------------------------------------------  
             STEEL SHIPMENTS BY PRODUCT                                                                             
              Sheet and semi-finished steel                                                                         
              products                                         8,170         8,677      8,721     7,988      7,613  
              Tubular, plate and tin mill                                                                           
              products                                         3,473         2,695      2,657     2,580      2,356  
                                                           -------------------------------------------------------
              Total                                           11,643        11,372     11,378    10,568      9,969  
              Total as % of domestic steel                                                                          
              industry                                          10.9          11.3       11.7      11.1       11.3  
             ------------------------------------------------------------------------------------------------------  
             STEEL SHIPMENTS BY MARKET                                                                              
              Steel service centers                            2,746         2,831      2,564     2,780      2,831  
              Transportation                                   1,758         1,721      1,636     1,952      1,771  
              Further conversion:                                                                                   
               Joint ventures                                  1,568         1,542      1,332     1,308      1,074  
               Trade customers                                 1,378         1,227      1,084     1,058      1,150  
              Containers                                         856           874        857       962        835  
              Construction                                       994           865        671       722        667  
              Oil, gas and petrochemicals                        810           746        748       367        342  
              Export                                             453           493      1,515       355        327  
              All other                                        1,080         1,073        971     1,064        972  
                                                           -------------------------------------------------------
              Total                                           11,643        11,372     11,378    10,568      9,969   
              ----------------------------------------------------------------------------------------------------


              /(a)/ The reduction in coke production in 1997 reflected U. S.
                    Steel's entry into a strategic partnership with two limited
                    partners to acquire an interest in three coke batteries at
                    its Clairton (Pa.) Works.

              /(b)/ The Maple Creek Coal Mine, which was idled in January 1994
                    and sold in June 1995, produced 1.0 million net tons of
                    metallurgical coal and 0.7 million net tons of steam coal in
                    1993.

              /(c)/ The Cumberland Coal Mine, which was sold in June 1993,
                    produced 1.6 million net tons in 1993 prior to the sale.

                                                                            U-37

 
Five-Year Financial Summary

 
 
(Dollars in millions, except as noted)                       1997      1996           1995          1994           1993     
- ---------------------------------------------------------------------------------------------------------------------------- 
                                                                                                 
STATEMENT OF OPERATIONS                                                                                                     
 Revenues                                                  $22,588   $22,977/(a)/  $20,413/(a)/ $ 19,055/(a)/ $ 17,798/(a)/ 
 Income from operations                                      1,705     1,779/(a)/      726/(a)/    1,174/(a)/      285/(a)/ 
  Costs and expenses include:                                                                                               
   Inventory market valuation charges (credits)                284      (209)          (70)         (160)          241      
   Restructuring charges                                         -         -             -             -            42      
   Impairment of long-lived assets                               -         -           675             -             -      
 Income (loss) from continuing operations                  $   908   $   946/(a)/  $   217/(a)/ $    532/(a)/ $   (179)/(a)/
 Income (loss) from discontinued operations                     80         6             4           (31)           12      
 Extraordinary loss and cumulative effect of                                                                                
  changes in accounting principles                               -        (9)           (7)            -           (92)     
                                                           -----------------------------------------------------------------
  NET INCOME (LOSS)                                        $   988   $   943       $   214      $    501      $   (259)     
- ---------------------------------------------------------------------------------------------------------------------------- 
 APPLICABLE TO MARATHON STOCK                                                                                               
  Income (loss) before extraordinary loss                                                                                   
   and cumulative effect of changes in                                                                                      
   accounting principles                                   $   456   $   671       $   (87)     $    315      $    (12)     
  Income (loss) before extraordinary loss and                                                                               
   cumulative effect of changes in accounting                                                                               
   principles per share - basic (in dollars)                  1.59      2.33          (.31)         1.10          (.04)     
                        - diluted (in dollars)                1.58      2.31          (.31)         1.10          (.04)     
  Net income (loss)                                            456       664           (92)          315           (35)     
  Net income (loss) per share - basic (in dollars)            1.59      2.31          (.33)         1.10          (.12)     
                              - diluted (in dollars)          1.58      2.29          (.33)         1.10          (.12)     
  Dividends paid per share (in dollars)                        .76       .70           .68           .68           .68       
- ----------------------------------------------------------------------------------------------------------------------------  
 APPLICABLE TO STEEL STOCK
  Income (loss) before extraordinary loss and 
   cumulative effect of change in accounting principle     $   449   $   253       $   279      $    176      $   (190)
  Income (loss) before extraordinary loss and
   cumulative effect of change in accounting
   principle per share - basic (in dollars)                   5.24      3.00          3.53          2.35         (2.96)
                       - diluted (in dollars)                 4.88      2.97          3.43          2.33         (2.96)
  Net income (loss)                                            449       251           277           176          (259)
  Net income (loss) per share - basic (in dollars)            5.24      2.98          3.51          2.35         (4.04)
                              - diluted (in dollars)          4.88      2.95          3.41          2.33         (4.04)
  Dividends paid per share (in dollars)                       1.00      1.00          1.00          1.00          1.00
- ----------------------------------------------------------------------------------------------------------------------------  
 BALANCE SHEET POSITION AT YEAR-END
  Cash and cash equivalents                                $    54   $    55       $   131      $     48      $    268
  Total assets                                              17,284    16,980        16,743        17,517        17,414
  Capitalization:
   Notes payable                                           $   121   $    81       $    40      $      1      $      1
   Total long-term debt                                      3,403     4,212         4,937         5,599         5,970
   Minority interests/(b)/                                     432       250           250           250             5
   Redeemable Delhi Stock                                      195         -             -             -             -
   Preferred stock                                               3         7             7           112           112
   Common stockholders' equity                               5,397     5,015         4,321         4,190         3,752
                                                           ----------------------------------------------------------------- 
     Total capitalization                                  $ 9,551   $ 9,565       $ 9,555      $ 10,152      $  9,840
- ---------------------------------------------------------------------------------------------------------------------------- 
  % of total debt to capitalization/(c)/                      41.4      47.5          54.7          57.6          60.7
- ---------------------------------------------------------------------------------------------------------------------------- 
 CASH FLOW DATA                                                    
  Net cash from operating activities                       $ 1,458   $ 1,649       $ 1,632      $    817      $    952
  Capital expenditures                                       1,373     1,168         1,016         1,033         1,151
  Disposal of assets                                           481       443           157           293           469 
  Dividends paid                                               316       307           295           301           288  
- ----------------------------------------------------------------------------------------------------------------------------  
 EMPLOYEE DATA
  Total employment costs/(d)(e)/                           $ 2,289   $ 2,179       $ 2,186      $  2,281      $  2,128   
  Average number of employees/(d)/                          41,620    41,553        42,133        42,596        43,789 
  Number of pensioners at year-end                          97,051    99,713       102,449       105,227       108,079 
- ---------------------------------------------------------------------------------------------------------------------------- 


/(a)/  Reclassified to conform to 1997 classifications and exclude discontinued
       operations see Note 3, to the USX consolidated financial statements.

/(b)/  Includes preferred stock of subsidiary, minority interests in common
       stock of subsidiaries and trust preferred securities.

/(c)/  Total debt represents the sum of notes payable, total long-term debt and
       minority interests.

/(d)/  Excludes the Delhi Companies sold in 1997.

/(e)/  Excludes employee related costs attributable to restructuring charges or
       credits.

U-38

 
             Management's Discussion and Analysis

                USX Corporation ("USX") is a diversified company engaged
             primarily in the energy business through its Marathon Group, and in
             the steel business through its U. S. Steel Group.

                Effective October 31, 1997, USX sold Delhi Gas Pipeline
             Corporation and other subsidiaries of USX that comprised all of the
             USX - Delhi Group ("Delhi Companies"). On January 26, 1998, USX
             used the $195 million net proceeds from the sale to redeem all of
             the 9.45 million outstanding shares of USX - Delhi Group Common
             Stock. Accordingly, Management's Discussion and Analysis of the
             Delhi Group is not provided. However, the following discussion
             includes information about the Delhi Companies where appropriate.
             For additional discussion about the Delhi Companies, see Note 3 to
             the Consolidated Financial Statements.

                Effective January 1, 1998, the USX - Marathon Group and Ashland
             Inc. formed a new refining, marketing and transportation company,
             Marathon Ashland Petroleum LLC ("MAP"). For further discussion, see
             Note 31 to the Consolidated Financial Statements. The following
             discussion excludes MAP, except where otherwise noted.

                Management's Discussion and Analysis of USX Consolidated
             Financial Statements provides certain information about the
             Marathon and U. S. Steel Groups, particularly in Management's
             Discussion and Analysis of Operations by Industry Segment. More
             expansive Group information is provided in Management's Discussion
             and Analysis of the Marathon Group and U. S. Steel Group, which are
             included in the USX 1997 Form 10-K. Management's Discussion and
             Analysis should be read in conjunction with the USX Consolidated
             Financial Statements and Notes to Consolidated Financial
             Statements.

                Certain sections of Management's Discussion and Analysis include
             forward-looking statements concerning trends or events potentially
             affecting USX. These statements typically contain words such as
             "anticipates", "believes", "estimates", "expects" or similar words
             indicating that future outcomes are uncertain. In accordance with
             "safe harbor" provisions of the Private Securities Litigation
             Reform Act of 1995, these statements are accompanied by cautionary
             language identifying important factors, though not necessarily all
             such factors, that could cause future outcomes to differ materially
             from those set forth in forward-looking statements. For additional
             risk factors affecting the businesses of USX, see Supplementary
             Data  Disclosures About Forward-Looking Statements in the USX 1997
             Form 10-K.

MANAGEMENT'S DISCUSSION AND ANALYSIS OF INCOME

                REVENUES for each of the last three years are summarized in the
             following table:



             (Dollars in millions)                                                   1997      1996      1995
             -------------------------------------------------------------------------------------------------
                                                                                              
              Revenues/(a)(b)/
              Marathon Group                                                       $15,754   $16,394   $13,913
              U. S. Steel Group                                                      6,941     6,670     6,557
 
              Eliminations                                                            (107)      (87)      (57)
                                                                                   -------   -------   -------
                 Total USX Corporation revenues                                     22,588    22,977    20,413
             Less:
              Matching crude oil and refined product buy/sell transactions/(c)/      2,436     2,912     2,067
              Consumer excise taxes on petroleum products and merchandise/(c)/       2,736     2,768     2,708
                                                                                   -------   -------   -------
                 Revenues adjusted to exclude above items                          $17,416   $17,297   $15,638
             -------------------------------------------------------------------------------------------------


             /(a)/ Consists of sales, dividend and affiliate income, net gains
                   on disposal of assets, gain on affiliate stock offering and
                   other income. Amounts for 1996 and 1995 were reclassified in
                   1997 to include dividend and affiliate income, gain on
                   affiliate stock offering and other income, and to conform to
                   other 1997 classifications.

             /(b)/ Effective October 31, 1997, USX sold the Delhi Companies.
                   Excludes revenues of the Delhi Companies, which have been
                   reclassified as discontinued operations for all periods
                   presented.

             /(c)/ Included in both revenues and operating costs for the
                   Marathon Group and USX Consolidated, resulting in no effect
                   on income.

                   Adjusted revenues increased by $119 million, or 1%, in 1997
             as compared with 1996, reflecting a 4% increase for the U. S. Steel
             Group, partially offset by a 1% decrease for the Marathon Group.
             Adjusted revenues increased by $1,659 million, or 11%, in 1996 as
             compared with 1995, reflecting increases of 17% for the Marathon
             Group, and 2% for the U. S. Steel Group.

                                                                            U-39

 
             Management's Discussion and Analysis CONTINUED

                INCOME FROM OPERATIONS and certain items included in income from
             operations for each of the last three years are summarized in the
             following table:



             (Dollars in millions)                                          1997     1996     1995
             ----------------------------------------------------------------------------------------
                                                                                    
             Income from operations/(a)/
              Marathon Group                                               $  932   $1,296   $  147
              U. S. Steel Group                                               773      483      582
              Adjustments for discontinued operations                           -        -       (3)
                                                                           ------   ------   ------ 
                 Total USX Corporation income from operations               1,705    1,779      726
                                         
             Less: Certain favorable (unfavorable) items for
              Marathon Group
               IMV reserve adjustment/(b)/                                   (284)     209       70
               Net gains on certain asset sales/(c)/                            -       35        -
               Charges for withdrawal from MPA/(d)/                             -      (10)       -
               Certain state tax adjustments/(e)/                               -      (11)       -
               Impairment of long-lived assets/(f)/                             -        -     (659)
               Expected environmental remediation recoveries/(g)/               -        -       15
              U. S. Steel Group
               Effect of adoption of SOP 96-1/(h)/                            (20)       -        -
               Net gains on certain asset sales/(i)/                           15        -        -
               Certain other environmental accrual adjustments - net           11        -        -
               Gain on affiliate stock offering/(j)/                            -       53        -
               Certain Gary Works blast furnace repairs/(k)/                    -      (39)     (34)
               Employee reorganization charges/(l)/                             -      (13)       -
               Impairment of long-lived assets/(f)/                             -        -      (16)
               Adjustments for certain employee-related costs                   -        -       18
               Certain legal accruals                                           -        -      (44)
                                                                           ------   ------   ------   
                 Subtotal                                                    (278)     224     (650)
                                                                           ------   ------   ------
                 Income from operations adjusted to exclude above items    $1,983   $1,555   $1,376
             ----------------------------------------------------------------------------------------


             /(a)/ Consists of operating income, dividend and affiliate income,
                   net gains on disposal of investments, gain on affiliate stock
                   offering and other income. Excludes income from operations
                   from the Delhi Group, which has been reclassified as
                   discontinued operations for all periods presented. Amounts
                   for 1996 and 1995 were reclassified in 1997 to include
                   dividend and affiliate income, gain on affiliate stock
                   offering and other income, and to conform to other 1997
                   classifications. See Note 9 to the Consolidated Financial
                   Statements for a discussion of operating income.

             /(b)/ The inventory market valuation ("IMV") reserve reflects the
                   extent to which the recorded LIFO cost basis of crude oil and
                   refined products inventories exceeds net realizable value.
                   For additional discussion of this noncash adjustment, see
                   Management's Discussion and Analysis of Operations by
                   Industry Segment for the Marathon Group, herein.

             /(c)/ Net gain on sales of the Marathon Group's interests in a
                   domestic pipeline company and certain production properties.

             /(d)/ Marine Preservation Association ("MPA") is a non-profit oil
                   spill response group.

             /(e)/ Accrual of domestic production taxes for prior years.

             /(f)/ Related to adoption of Statement of Financial Accounting
                   Standards No. 121 - "Accounting For the Impairment of Long-
                   Lived Assets and for Long-Lived Assets to be Disposed Of "
                   ("SFAS No. 121").

             /(g)/ Expected recoveries from state governments of expenditures
                   related to underground storage tanks at retail marketing 
                   outlets.

             /(h)/ Effective January 1, 1997, USX adopted American Institute of
                   Certified Public Accountants Statement of Position No. 96-1 -
                   "Environmental Remediation Liabilities", which provides
                   additional guidance on recognition, measurement and
                   disclosure of remediation liabilities.

             /(i)/ Net gain on the sale of the plate mill at the U. S. Steel
                   Group's former Texas Works.

             /(j)/ See Note 8 to the Consolidated Financial Statements.

             /(k)/ Amounts in 1996 and 1995 reflect repair of damages incurred
                   at Gary Works during a hearth break-out at the No. 13 blast
                   furnace on April 2, 1996, and in an explosion at the No. 8
                   blast furnace on April 5, 1995, respectively.

             /(l)/ Primarily related to employee costs associated with work
                   force reduction programs.

U-40

 
             Management's discussion and Analysis CONTINUED
     
                Adjusted income from operations increased by $428 million in
             1997 as compared with 1996, reflecting increases of $285 million
             for the U. S. Steel group and $143 million for the Marathon Group.
             Adjusted income from operations increased by $179 million in 1996
             as compared with 1995, primarily reflecting an increase of $352
             million for the Marathon Group, partially offset by a decline of
             $176 million for the U. S. Steel Group. For further discussion, see
             Management's Discussion and Analysis of Operations by Industry
             Segment, herein.

                Net pension credits included in income from operations totaled
             $157 million in 1997, compared with $162 million in 1996, and $144
             million in 1995. The decrease in 1997 from 1996 primarily reflected
             a reduction in the expected long-term rate of return on plan
             assets, partially offset by an increase in market-related value of
             plan assets and an increase in the assumed discount rate. The
             increase in 1996 from 1995 primarily reflected a decrease in the
             assumed discount rate and an increase in the market-related value
             of plan assets. For further discussion, see Note 10 to the
             Consolidated Financial Statements.

                NET INTEREST AND OTHER FINANCIAL COSTS for each of the last
             three years are summarized in the following table:



             (Dollars in millions)                                  1997    1996   1995        
             ----------------------------------------------------------------------------
                                                                             
             Interest and other financial income/(a)/               $   5  $   7   $  20 
             Interest and other financial costs                       352    428     486 
                                                                    -----  -----   -----  
                 Net interest and other financial costs/(a)/          347    421     466 
                                                                                         
             Less:                                                                       
              Favorable (unfavorable) adjustments to                                     
                carrying value of Indexed Debt/(b)/                    10     (6)      -  
              Favorable effect of interest on refundable federal                         
               income taxes paid in prior years                         -      -      20 
                                                                    -----  -----   -----  
                 Net interest and other financial costs                                  
                  adjusted to exclude above items                   $ 357  $ 415   $ 486  
             ----------------------------------------------------------------------------


             /(a)/ Amounts in 1996 and 1995 have been restated to conform to
                   1997 classifications.

             /(b)/ In December 1996, USX issued $117 million of 6 3/4%
                   Exchangeable Notes Due February 1, 2000 ("Indexed Debt")
                   indexed to the price of RMI Titanium Company ("RMI") common
                   stock. At maturity, USX must exchange these notes for shares
                   of RMI common stock, or redeem the notes for the equivalent
                   amount of cash. The carrying value of Indexed Debt is
                   adjusted quarterly to settlement value, based on changes in
                   the value of RMI common stock. Any resulting adjustment is
                   charged or credited to income and included in interest and
                   other financial costs. USX's 27% interest in RMI continues to
                   be accounted for under the equity method.

                Excluding effects of the items detailed in the above table,
             interest and other financial costs decreased by $58 million in 1997
             as compared with 1996, and by $71 million in 1996 as compared with
             1995, due primarily to lower average debt levels. The decrease in
             1997 also reflected increased capitalized interest on Marathon
             Group worldwide exploration and production projects. For additional
             information, see Note 6 to the Consolidated Financial Statements.

                The PROVISION FOR ESTIMATED INCOME TAXES was $450 million in
             1997, compared with $412 million in 1996 and $43 million in 1995.
             Provisions included credits other than foreign tax credits of $24
             million and $48 million in 1997 and 1996, respectively (primarily
             nonconventional fuel source credits). A significant portion of the
             reduction in these credits in 1997 as compared with 1996 resulted
             from USX's entry into a strategic partnership with two limited
             partners to acquire an interest in three coke batteries at its U.
             S. Steel Group's Clairton (Pa.) Works. See Note 14 to the
             Consolidated Financial Statements for additional discussion. The
             provision in 1995 included a $39 million incremental U.S. income
             tax benefit resulting from USX's election to credit, rather than
             deduct, foreign income taxes for U.S. federal income tax purposes.
             For reconciliation of the federal statutory rate to total
             provisions on income from continuing operations, see Note 12 to the
             Consolidated Financial Statements.

                                                                            U-41

 
             Management's Discussion and Analysis CONTINUED

                EXTRAORDINARY LOSS in 1996 and 1995 reflected unfavorable
             aftertax effects of early extinguishment of debt. In December 1996,
             USX irrevocably called for redemption on January 30, 1997, 8-1/2%
             Sinking Fund Debentures Due 2006, with a carrying value of $120
             million, resulting in an extraordinary loss of $9 million, net of
             an income tax benefit of $5 million. In 1995, USX extinguished $553
             million of debt prior to maturity, primarily consisting of Zero
             Coupon Convertible Senior Debentures Due 2005, with a carrying
             value of $393 million ($264 million in original proceeds and $129
             million of amortized discount) and $83 million of 8-1/2% Sinking
             Fund Debentures, which resulted in an extraordinary loss of $7
             million, net of an income tax effect of $4 million.

                INCOME FROM DISCONTINUED OPERATIONS reflects aftertax income of
             the Delhi Companies sold during 1997. Income in 1997 included an
             $81 million gain on disposal of the Delhi Companies (net of income
             taxes). For additional discussion, see Note 3 to the Consolidated
             Financial Statements.

                NET INCOME was $988 million in 1997, $943 million in 1996 and
             $214 million in 1995. Excluding the effects of the $81 million gain
             on disposal related to discontinued operations in 1997, the $430
             million unfavorable effect of adoption of SFAS No. 121 in 1995, and
             adjustments to the inventory market valuation reserve in each of
             1997, 1996 and 1995, net income increased by $275 million in 1997
             as compared with 1996 and by $211 million in 1996 as compared with
             1995.

                NONCASH CREDIT FROM EXCHANGE OF PREFERRED STOCK was $10 million,
             or 12 cents per share of Steel Stock, in 1997. In May 1997, USX
             exchanged 3.9 million 6.75% Convertible Quarterly Income Preferred
             Securities ("Trust Preferred Securities") of USX Capital Trust I
             for an equivalent number of shares of its outstanding 6.50%
             Cumulative Convertible Preferred Stock ("6.50% Preferred Stock").
             The $10 million noncash credit reflects the difference between the
             carrying value of the 6.50% Preferred Stock and the fair value of
             the Trust Preferred Securities at the date of the exchange. See
             Note 26 to the Consolidated Financial Statements for additional
             discussion.

MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION, CASH FLOWS AND
LIQUIDITY

                CURRENT ASSETS increased by $70 million from year-end 1996,
             primarily reflecting increased deferred income tax benefits and
             receivable balances, partially offset by a decline in inventory
             balances. The increase in deferred income tax benefits was
             primarily due to expectations of the increased utilization of
             federal tax credit carryforwards within the next year. The increase
             in receivables primarily reflected a net increase in trade
             receivables following USX's termination of the Marathon Group
             receivable sales program and sale of the Delhi Companies in late
             1997. The decrease in inventories primarily reflected lower year-
             end refined product prices resulting in a $284 million increase to
             the inventory market valuation reserve.

                NET PROPERTY, PLANT AND EQUIPMENT decreased by $342 million from
             year-end 1996, primarily reflecting depreciation, depletion and
             amortization ("DD&A") expense of $967 million and the sale in 1997
             of the Delhi Companies with net property plant and equipment of
             $608 million at the time of the sale, partially offset by property
             additions. For discussion of property additions, see Capital
             Expenditures, herein.

                DEFERRED CREDITS AND OTHER LIABILITIES increased by $300 million
             from year-end 1996 due primarily to unamortized deferred gains of
             $244 million related to USX's entry in 1997 into a strategic
             partnership with two limited partners to acquire an interest in
             three coke batteries at the U. S. Steel Group's Clairton (Pa.)
             Works.

                TOTAL LONG-TERM DEBT AND NOTES PAYABLE decreased by $769 million
             from year-end 1996, mainly reflecting cash flows provided from
             operating activities and asset sales during 1997, in excess of cash
             used for capital expenditures, dividend payments and investments in
             equity affiliates. At December 31, 1997, USX had available its
             long-term revolving credit agreement of $2,350 million, short-term
             lines of credit of $200 million and a short-term credit agreement
             of $125 million, against which it had no outstanding borrowings.
             USX had outstanding borrowings of $121 million against uncommitted
             lines of credit. USX's short-term lines of credit require a 1/8%
             fee or maintenance of compensating balances of 3%.

U-42

 
             Management's Discussion and Analysis CONTINUED
    
                STOCKHOLDERS' EQUITY increased by $378 million from year-end
             1996 mainly reflecting 1997 net income, partially offset by
             dividends paid and a decrease in additional paid-in capital. The
             decrease in additional paid-in capital resulted primarily from the
             exchange of 6.50% Preferred Stock for Trust Preferred Securities,
             and reclassification of equity in the Delhi Group to redeemable
             Delhi Stock, following the sale of the Delhi Companies in late
             1997. For further discussion of Trust Preferred Securities, see
             Financial Obligations, herein, the Consolidated Statement of
             Stockholders' Equity and Note 26 to the Consolidated Financial
             Statements.

                NET CASH FROM OPERATING ACTIVITIES was $1,458 million in 1997,
             $1,649 million in 1996 and $1,632 million in 1995. Cash provided
             from operating activities in 1997 included a payment of $390
             million resulting from termination of a Marathon Group and Delhi
             Group accounts receivable sales program, payments of $199 million
             to fund employee benefit plans related to the U. S. Steel Group,
             and insurance recoveries of $40 million related to a 1996 hearth
             breakout at the Gary Works No. 13 blast furnace. Cash provided from
             operating activities in 1996 included a payment of $59 million to
             the Internal Revenue Service for certain agreed and unagreed
             adjustments relating to the tax year 1990, payments of $39 million
             related to certain state tax issues, and a payment of $28 million
             related to settlement of the Pickering litigation. Excluding the
             effects of these adjustments, cash provided from operating
             activities increased by $232 million in 1997 as compared with 1996,
             due primarily to favorable working capital changes, improved
             profitability and reduced interest payments, partially offset by
             increased income taxes paid.

                Net cash provided from operating activities in 1995 included
             payments of $204 million to fund employee benefit plans related to
             the U. S. Steel Group, $129 million for amortized discount on USX's
             zero coupon debentures and $20 million as partial settlement in the
             Pickering litigation. Excluding the effects of these adjustments,
             cash provided from operating activities decreased by $210 million
             in 1996 as compared with 1995, due primarily to unfavorable working
             capital changes.

                For additional discussion of 1997 funding of U. S. Steel benefit
             plans, see Benefit Plan Activity, herein.

                CAPITAL EXPENDITURES for each of the last three years are
             summarized in the following table:



             (Dollars in millions)                                      1997    1996    1995
             ---------------------------------------------------------------------------------
                                                                              
             Marathon Group
              Exploration and production ("Upstream")          
               United States                                           $  647  $  424  $  322
               International                                              163      80     141
              Refining, marketing and transportation ("Downstream")       216     222     169
              Other                                                        12      25      10
                                                                       ------  ------  ------
                 Subtotal Marathon Group                                1,038     751     642
             U. S. Steel Group                                            261     337     324
             Discontinued operations (Delhi Group)/(a)/                    74      80      50
                                                                       ------  ------  ------
                 Total USX Corporation capital expenditures            $1,373  $1,168  $1,016
             ---------------------------------------------------------------------------------


             /(a)/ Effective October 31, 1997, USX sold Delhi Gas Pipeline
                   Corporation and other subsidiaries of USX that comprised all
                   of the Delhi Group.

                   Marathon Group's domestic upstream capital expenditures in
             1997 mainly included development of Gulf of Mexico properties,
             including Viosca Knoll 786 (Petronius), Green Canyon 244 (Troika),
             Ewing Bank 963 (Arnold) and Ewing Bank 917 (Oyster). International
             upstream capital expenditures included development of the West Brae
             field in the U.K. North Sea and projects in Egypt and offshore
             Gabon. Downstream capital expenditures in 1997 were primarily for
             upgrading and expanding Emro Marketing Company's network of retail
             outlets, and refinery modification projects.

                   U. S. Steel Group capital expenditures in 1997 included a
             blast furnace reline at Mon Valley Works, a new heat-treat line for
             plate products at Gary Works and environmental expenditures,
             primarily at Gary Works.

                                                                            U-43

 
             Management's Discussion and Analysis CONTINUED
  
                CAPITAL EXPENDITURES IN 1998 are expected to be $1.6 billion.
             Expenditures for the Marathon Group are expected to be
             approximately $1.3 billion. The increase from 1997 levels primarily
             reflects inclusion of 100% of the capital requirements for MAP.
             Domestic upstream projects planned for 1998 include continuing
             development of projects in the Gulf of Mexico. International
             upstream projects include development of properties offshore Gabon.
             Downstream spending is expected to be primarily for retail
             marketing upgrading and expansion projects and refinery
             modifications.

                Capital expenditures for the U. S. Steel Group in 1998 are
             expected to be approximately $340 million. Planned projects include
             a reline of the No. 6 blast furnace and other projects at Gary
             Works, and environmental expenditures.

                INVESTMENTS IN EQUITY AFFILIATES of $249 million in 1997, mainly
             reflected funding of Marathon Group equity affiliates' capital
             projects, primarily the Sakhalin II project in Russia and the
             Nautilus natural gas pipeline system in the Gulf of Mexico. Also
             included were the Marathon Group's acquisition of an additional
             7.5% interest in Sakhalin Energy Investment Company Ltd. ("Sakhalin
             Energy"), investment in the Odyssey crude oil pipeline system in
             the Gulf of Mexico (with a 29% interest) and acquisition of a 50%
             ownership in a power generation company in Ecuador. Sakhalin Energy
             is the incorporated joint venture company responsible for the
             Sakhalin II project. Following the acquisition of the additional
             interest, the Marathon Group holds a 37.5% interest in Sakhalin
             Energy. Investments in U. S. Steel Group equity affiliate capital
             projects included the addition of a second galvanizing line at the
             PRO-TEC Coating Company joint venture in northwest Ohio.

                INVESTMENTS IN EQUITY AFFILIATES IN 1998 are expected to be
             approximately $210 million. Projected investments include
             additional funding of Sakhalin Energy's spending on the Sakhalin II
             project, a U. S. Steel Group 50%-owned joint venture in the Slovak
             Republic, and Marathon Group power generation projects. Although
             project expenditures for the Sakhalin II project remain high,
             third-party financing arranged by Sakhalin Energy is expected to
             reduce the need for direct investment by the Marathon Group in
             1998.

                Contract commitments for capital expenditures were $424 million
             at year-end 1997, compared with $526 million at year-end 1996.

                The above statements with respect to 1998 capital expenditures
             and investments are forward-looking statements reflecting
             management's best estimates based on information currently
             available. To the extent this information proves to be inaccurate,
             the timing and levels of future expenditures and investments could
             differ materially from those included in the forward-looking
             statements. Factors that could cause future capital expenditures
             and investments to differ materially include changes in industry
             supply and demand, general economic conditions, the availability of
             business opportunities and levels of cash flow from operations for
             each of the Groups. The timing of completion or cost of particular
             capital projects could be affected by unforeseen hazards such as
             weather conditions, explosions or fires, or by delays in obtaining
             government or partner approval. In addition, levels of investments
             may be affected by the ability of equity affiliates to obtain
             third-party financing.

                PROCEEDS FROM SALE OF THE DELHI COMPANIES totaled $752 million.
             In January 1998, USX used the net proceeds of $195 million to
             redeem all of the 9.45 million outstanding shares of USX - Delhi
             Group Common Stock. For additional discussion, including a
             reconcilement of proceeds from the sale to net proceeds, see Note 3
             to the Consolidated Financial Statements.

                PROCEEDS FROM DISPOSAL OF ASSETS were $481 million in 1997,
             compared with $443 million in 1996 and $157 million in 1995.
             Proceeds in 1997 included $361 million resulting from USX's entry
             into a strategic partnership with two limited partners to acquire
             an interest in three coke batteries at its U. S. Steel Group's
             Clairton Works and $15 million from the sale of the plate mill at
             the U. S. Steel Group's former Texas Works. Proceeds in 1996
             primarily reflected the sale of the U. S. Steel Group's investment
             in National-Oilwell (an oil field service joint venture); the sale
             of a portion of its investment in RMI common stock; disposal of the
             Marathon Group's interests in Alaskan oil properties and certain
             domestic and international oil and gas production properties; and
             the sale of the Marathon Group's equity interest in a domestic
             pipeline company. Proceeds in 1995 primarily reflected sales of
             certain domestic oil and gas production properties, mainly in the
             Illinois Basin, and other properties.

                WITHDRAWAL FROM PROPERTY EXCHANGE TRUSTS of $98 million in 1997
             mainly represents cash withdrawn from an interest-bearing escrow
             account that was established in 1996 in connection with the
             disposal of oil production properties in Alaska.

U-44

 
             Management's Discussion and Analysis CONTINUED

                FINANCIAL OBLIGATIONS (the net of debt repayments, borrowings,
             commercial paper and revolving credit arrangements on the
             Consolidated Statement of Cash Flows) decreased by $734 million in
             1997, compared with decreases of $673 million in 1996 and $511
             million in 1995. These amounts represent financial activities
             involving commercial paper, revolving credit agreements, lines of
             credit, other debt and preferred stock of a subsidiary. The
             decrease in financial obligations in each of the three years
             primarily reflected cash flows provided from operating activities
             and asset sales in excess of cash used for capital expenditures and
             dividend payments (and with respect to 1997, in excess of $249
             million of cash used for investments in equity affiliates).
             Financial obligations for USX obligated mandatorily redeemable
             convertible preferred securities of a subsidiary trust resulted
             from a noncash exchange in 1997.

                In 1997, USX redeemed, prior to maturity, $180 million of 5-3/4%
             Convertible Subordinated Debentures Due 2001, $227 million of 7%
             Convertible Subordinated Debentures Due 2017, $120 million of 8.50%
             Sinking Fund Debentures Due 2006 and $41 million of Zero Coupon
             Convertible Senior Debentures Due 2005. Maturities of long-term
             debt during 1997 consisted of $150 million of 8-7/8% Notes Due
             1997. In 1996, USX redeemed, prior to maturity, $161 million of
             Marathon Oil Company 9-3/4% Guaranteed Notes Due 1999. In 1995, USX
             extinguished, prior to maturity, $553 million of debt, primarily
             consisting of Zero Coupon Convertible Senior Debentures Due 2005,
             with a carrying value of $393 million ($264 million in original
             proceeds and $129 million of amortized discount) and $83 million of
             8-1/2% Sinking Fund Debentures. Also in 1995, USX redeemed all of
             the outstanding shares of its Adjustable Rate Cumulative Preferred
             Stock at a cost of $105 million.

                Issuance of long-term debt and Trust Preferred Securities for
             each of the last three years is summarized in the following table:



             (Dollars in millions)                                        1997      1996      1995  
             ---------------------------------------------------------------------------------------
                                                                                           
             Aggregate principal amounts of:                                                           
              Trust Preferred Securities/(a)/                           $   182   $     -    $     -    
              Indexed Debt/(b)/                                               -       117          -   
              Environmental Improvement Revenue Refunding Bonds/(c)/          -        78         53   
                                                                        -------   -------    -------   
                 Total                                                  $   182   $   195    $    53    
             ---------------------------------------------------------------------------------------
                                                            

             /(a)/ In 1997, USX exchanged 3.9 million 6.75% Convertible
                   Quarterly Income Preferred Securities ("Trust Preferred
                   Securities") of USX Capital Trust I for an equivalent number
                   of shares of USX's 6.50% Cumulative Convertible Preferred
                   Stock. This was a noncash transaction. For additional
                   discussion, see Note 26 to the Consolidated Financial
                   Statements.

             /(b)/ See description below.

             /(c)/ Issued to refinance certain environmental improvement bonds.

                   USX currently has three effective shelf registration
             statements with the Securities and Exchange Commission aggregating
             $943 million, of which $633 million is dedicated to offer and issue
             debt securities ("Debt Shelf"). The balance allows USX to offer and
             issue debt and/or equity securities. In December 1996, USX issued,
             under its Debt Shelf, $117 million in aggregate principal amount of
             Indexed Debt, mandatorily exchangeable at maturity for common stock
             of RMI (or for the equivalent amount of cash, at USX's option) at a
             defined exchange rate based upon the average market price of RMI
             common stock valued in January 2000. The carrying value of the
             notes is adjusted quarterly to settlement value and any resulting
             adjustment is charged or credited to income and included in
             interest and other financial costs. At December 31, 1997, the
             adjusted carrying value of Indexed Debt was $113 million. At
             December 31, 1997, USX owned 5,483,600 shares of RMI common stock,
             constituting approximately 27% of the outstanding shares.

                   In the event of a change in control of USX, debt and
             guaranteed obligations totaling $3.5 billion at year-end 1997 may
             be declared immediately due and payable or required to be
             collateralized. See Notes 13, 16 and 18 to the Consolidated
             Financial Statements.

                   DIVIDENDS PAID increased by $9 million in 1997 as compared
             with 1996, due primarily to the full-year effect of a two-cents-
             per-share increase in the quarterly USX - Marathon Group Common
             Stock dividend rate declared October 29, 1996. The increase was
             partially offset by decreased dividends on preferred stock,
             reflecting 6.50% Preferred Stock exchanged for Trust Preferred
             Securities during 1997. Dividends paid increased by $12 million in
             1996 as compared with 1995, due primarily to the sale of 5,000,000
             shares of USX -U.S. Steel Group Common Stock ("Steel Stock") to the
             public in 1995 and the previously mentioned increase in the
             quarterly USX - Marathon Group Common Stock dividend rate.

                                                                            U-45

 
             Management's Discussion and Analysis CONTINUED

                In January 1998, the USX Board of Directors declared a fourth
             quarter dividend on the USX - Marathon Group Common Stock of 21
             cents per share, an increase of two cents per share over the
             previous quarterly dividend. Total dividends paid on the USX -
             Marathon Group Common Stock in the first quarter of 1998 will
             increase by approximately $6 million as a result of this dividend
             increase.

             BENEFIT PLAN ACTIVITY

                In accordance with USX's long-term funding practice, which is
             designed to maintain an appropriate funded status, USX contributed
             $49 million in 1997 to fund the U. S. Steel Group's principal
             pension plan for the 1996 plan year. In 1995, net proceeds of $169
             million from the public offering of 5,000,000 shares of Steel Stock
             were used to fund the U. S. Steel Group's principal pension plan
             for the 1994 and the 1995 plan years.

                Also in 1997, USX contributed $80 million for elective funding
             of retiree life insurance of union and nonunion participants, and
             $70 million to the United Steelworkers of America ("USWA")
             Voluntary Employee Benefit Association Trust ("VEBA"). A total of
             $40 million of the $70 million VEBA contribution represented
             prefunding for the years 1998 and 1999.

             DEBT AND PREFERRED STOCK RATINGS

                Standard & Poor's Corp. currently rates USX and Marathon Oil
             Company ("Marathon") senior debt as investment grade, following an
             upgrade in November 1996 to BBB- from BB+. USX's subordinated debt
             and preferred stock were also upgraded to BB+ from BB-. Moody's
             Investors Services, Inc. currently rates USX's and Marathon's
             senior debt as investment grade at Baa3 and USX's subordinated debt
             and preferred stock as Ba2. Duff & Phelps Credit Rating Co.
             currently rates USX's senior notes as investment grade at BBB and
             USX's subordinated debt as BBB-.

             DERIVATIVE INSTRUMENTS
                See Quantitative and Qualitative Disclosures About Market Risk
             for discussion of derivative instruments and associated market
             risk.

             LIQUIDITY

                USX management believes that its short-term and long-term
             liquidity is adequate to satisfy its obligations as of December 31,
             1997, and to complete currently authorized capital spending
             programs. Future requirements for USX's business needs, including
             the funding of capital expenditures, debt maturities for the years
             1998, 1999 and 2000, and any amounts that may ultimately be paid in
             connection with contingencies (which are discussed in Note 30 to
             the Consolidated Financial Statements), are expected to be financed
             by a combination of internally generated funds, proceeds from the
             sale of stock, borrowings or other external financing sources.

                USX management's opinion concerning liquidity and USX's ability
             to avail itself in the future of the financing options mentioned in
             the above forward-looking statements are based on currently
             available information. To the extent that this information proves
             to be inaccurate, future availability of financing may be adversely
             affected. Factors that affect the availability of financing include
             the performance of each Group (as indicated by levels of cash
             provided from operating activities, and other measures), the state
             of the debt and equity markets, investor perceptions and
             expectations of past and future performance, the overall U.S.
             financial climate, and, in particular, with respect to borrowings,
             levels of USX's outstanding debt and credit ratings by rating
             agencies. For a summary of long-term debt, see Note 16 to the
             Consolidated Financial Statements.

U-46

 
            Management's Discussion and Analysis C O N T I N U E D

MANAGEMENT'S DISCUSSION AND ANALYSIS OF ENVIRONMENTAL MATTERS, LITIGATION AND
CONTINGENCIES

                USX has incurred and will continue to incur substantial capital,
             operating and maintenance, and remediation expenditures as a result
             of environmental laws and regulations. To the extent these
             expenditures, as with all costs, are not ultimately reflected in
             the prices of USX's products and services, operating results will
             be adversely affected. USX believes that domestic competitors of
             the U. S. Steel Group and substantially all the competitors of the
             Marathon Group are subject to similar environmental laws and
             regulations. However, the specific impact on each competitor may
             vary depending on a number of factors, including the age and
             location of its operating facilities, marketing areas, production
             processes and the specific products and services it provides.

                The following table summarizes USX's environmental expenditures
             for each of the last three years/(a)/:



             (Dollars in millions)                 1997   1996   1995
             ---------------------------------------------------------
                                                       
             Capital
              Marathon Group                      $  81  $  66  $  50
              U. S. Steel Group                      43     90     55
              Discontinued operations/(b)/           10      9      6
                                                  -----  -----  -----
                 Total capital                    $ 134  $ 165  $ 111
             --------------------------------------------------------  
             Compliance
              Operating & maintenance
               Marathon Group                     $  84  $  75  $ 102
               U. S. Steel Group                    196    199    195
               Discontinued operations/(b)/           4      4      4
                                                  -----  -----  -----
                 Total operating & maintenance      284    278    301
              Remediation/(c)/
               Marathon Group                        19     26     37
               U. S. Steel Group                     29     33     35
                                                  -----  -----  -----
                 Total remediation                   48     59     72
                 Total compliance                 $ 332  $ 337  $ 373
             --------------------------------------------------------  


             /(a)/Amounts for the Marathon Group are based on American
                  Petroleum Institute survey guidelines. Amounts for the U. S.
                  Steel Group are based on previously established U.S.
                  Department of Commerce survey guidelines.
             /(b)/Effective October 31, 1997, USX sold Delhi Gas Pipeline
                  Corporation and other subsidiaries of USX that comprised all
                  of the Delhi Group.
             /(c)/Amounts do not include noncash provisions recorded for
                  environmental remediation, but include spending charged
                  against such reserves, net of recoveries where permissible.

                  USX's environmental capital expenditures accounted for 10%,
             14% and 11% of total consolidated capital expenditures in 1997,
             1996 and 1995, respectively.

                  USX's environmental compliance expenditures averaged 2% of
             total consolidated operating costs in each of 1997, 1996 and 1995.
             Remediation spending primarily reflected ongoing clean-up costs for
             soil and groundwater contamination associated with underground
             storage tanks and piping at retail gasoline stations, and
             remediation activities at former and present operating locations.

                  The Resource Conservation and Recovery Act ("RCRA")
             establishes standards for the management of solid and hazardous
             wastes. Besides affecting current waste disposal practices, RCRA
             also addresses the environmental effects of certain past waste
             disposal operations, the recycling of wastes and the regulation of
             storage tanks.

                  A significant portion of USX's currently identified
             environmental remediation projects relate to the remediation of
             former and present operating locations. These projects include
             continuing remediation at an in situ uranium mining operation, the
             remediation of former coke-making facilities, a closed and
             dismantled refinery site and the closure of permitted hazardous and
             non-hazardous waste landfills.

                  USX has been notified that it is a potentially responsible
             party ("PRP") at 45 waste sites under the Comprehensive
             Environmental Response, Compensation and Liability Act ("CERCLA")
             as of December 31, 1997. In addition, there are 27 sites where USX
             has received information requests or other indications that USX may
             be a PRP under CERCLA but where sufficient information is not
             presently available to confirm the existence of liability. There
             are also 110 additional sites, excluding

                                                                            U-47

 
             Management's Discussion and Analysis C O N T I N U E D 

             retail gasoline stations, where remediation is being sought under
             other environmental statutes, both federal and state, or where
             private parties are seeking remediation through discussions or
             litigation. At many of these sites, USX is one of a number of
             parties involved and the total cost of remediation, as well as
             USX's share thereof, is frequently dependent upon the outcome of
             investigations and remedial studies. USX accrues for environmental
             remediation activities when the responsibility to remediate is
             probable and the amount of associated costs is reasonably
             determinable. As environmental remediation matters proceed toward
             ultimate resolution or as additional remediation obligations arise,
             charges in excess of those previously accrued may be required. See
             Note 30 to the Consolidated Financial Statements.

                New or expanded environmental requirements, which could increase
             USX's environmental costs, may arise in the future. USX intends to
             comply with all legal requirements regarding the environment, but
             since many of them are not fixed or presently determinable (even
             under existing legislation) and may be affected by future
             legislation, it is not possible to predict accurately the ultimate
             cost of compliance, including remediation costs which may be
             incurred and penalties which may be imposed. However, based on
             presently available information, and existing laws and regulations
             as currently implemented, USX does not anticipate that
             environmental compliance expenditures (including operating and
             maintenance and remediation) will materially increase in 1998. USX
             expects environmental capital expenditures in 1998 to be
             approximately $165 million, or approximately 10% of total estimated
             consolidated capital expenditures. Predictions beyond 1998 can only
             be broad-based estimates which have varied, and will continue to
             vary, due to the ongoing evolution of specific regulatory
             requirements, the possible imposition of more stringent
             requirements and the availability of new technologies, among other
             matters. Based upon currently identified projects, USX anticipates
             that environmental capital expenditures in 1999 will total
             approximately $110 million; however, actual expenditures may vary
             as the number and scope of environmental projects are revised as a
             result of improved technology or changes in regulatory requirements
             and could increase if additional projects are identified or
             additional requirements are imposed.

                Effective January 1, 1997, USX adopted American Institute of
             Certified Public Accountants Statement of Position No. 96-1 -
             "Environmental Remediation Liabilities", which requires that
             companies include certain direct costs and post-closure monitoring
             costs in accruals for remediation liabilities. USX income from
             operations included first quarter charges of $27 million (net of
             expected recoveries) related to adoption, primarily for accruals of
             post-closure monitoring costs, study costs and administrative
             costs. See Note 2 to the Consolidated Financial Statements for
             additional discussion.

                Income from operations in 1997 also included net favorable
             effects of $13 million related to other environmental accrual
             adjustments.

                USX is the subject of, or party to, a number of pending or
             threatened legal actions, contingencies and commitments involving a
             variety of matters. The ultimate resolution of these contingencies
             could, individually or in the aggregate, be material to the
             consolidated financial statements. However, management believes
             that USX will remain a viable and competitive enterprise even
             though it is possible that these contingencies could be resolved
             unfavorably.

             OUTLOOK AND YEAR 2000

                For Outlook with respect to the Marathon Group and U. S. Steel
             Group, see Management's Discussion and Analysis of Operations by
             Industry Segment, herein.

                For discussion of the Year 2000 issue as it affects the Marathon
             Group and the U. S. Steel Group, see Management's Discussion and
             Analysis of Operations by Industry Segment, herein.

             ACCOUNTING STANDARDS

                In June 1997, the Financial Accounting Standards Board issued
             two new accounting standards:

                Statement of Financial Accounting Standards No. 130, "Reporting
             Comprehensive Income" requires that companies report all recognized
             changes in assets and liabilities that are not the result of
             transactions with owners, including those that are not reported in
             net income. USX plans to adopt the standard, effective with its
             1998 financial statements, as required.

                Statement of Financial Accounting Standards No. 131,
             "Disclosures about Segments of an Enterprise and Related
             Information" introduces a "management approach" for identifying
             reportable industry segments of an enterprise. USX plans to adopt
             the standard, effective with its 1998 financial statements, as
             required.

U-48 

 
             Management's Discussion and Analysis C O N T I N U E D  

MANAGEMENT'S DISCUSSION AND ANALYSIS OF OPERATIONS BY INDUSTRY SEGMENT

             THE MARATHON GROUP

                The Marathon Group consists of Marathon Oil Company and certain
             other subsidiaries of USX, which are engaged in worldwide
             exploration, production, transportation and marketing of crude oil
             and natural gas; domestic refining, marketing and transportation of
             petroleum products; and power generation. Effective January 1,
             1998, the USX  Marathon Group and Ashland Inc. formed a new
             refining, marketing and transportation company, Marathon Ashland
             Petroleum LLC.

                Marathon Group REVENUES (excluding matching buy/sell
             transactions and excise taxes) decreased by $132 million in 1997
             from 1996, and increased by $1,576 million in 1996 from 1995. The
             decrease in 1997 was due primarily to lower average refined product
             prices and worldwide liquid hydrocarbon prices and volumes,
             partially offset by increased volumes of refined products and
             increased volumes and higher prices for domestic natural gas. The
             increase in 1996 from 1995 was due primarily to higher average
             prices for refined products, worldwide liquid hydrocarbons and
             natural gas, partially offset by decreased volumes for worldwide
             liquid hydrocarbons.

                Marathon Group INCOME FROM OPERATIONS and certain items included
             in income from operations for each of the last three years are
             summarized in the following table:



             (Dollars in millions)                                           1997     1996    1995
             --------------------------------------------------------------------------------------
                                                                                    
 
             Income from operations/(a)/                                   $  932   $1,296   $ 147
             Less: Certain favorable (unfavorable) items
              IMV reserve adjustment/(b)/                                    (284)     209      70
              Net gains on certain asset sales/(c)/                            -        35      -
              Charges for withdrawal from MPA/(d)/                             -       (10)     -
              Certain state tax adjustments/(e)/                               -       (11)     -
              Impairment of long-lived assets/(f)/                             -        -     (659)
              Expected environmental remediation recoveries/(g)/               -        -       15
                                                                           -------  -------  ------
                 Subtotal                                                    (284)     223    (574)
                                                                           -------  -------  ------
                 Income from operations adjusted to exclude above items    $1,216   $1,073   $ 721
             --------------------------------------------------------------------------------------

             /(a)/Consists of operating income, dividend and affiliate income,
                  net gains on disposal of investments and other income. Amounts
                  for 1996 and 1995 were reclassified in 1997 to include
                  dividend and affiliate income and other income, and to conform
                  to other 1997 classifications. See Note 9 to the Consolidated
                  Financial Statements for a discussion of operating income.
             /(b)/The inventory market valuation reserve ("IMV") reflects the
                  extent to which the recorded LIFO cost basis of crude oil and
                  refined products inventories exceeds net realizable value. For
                  additional details of this noncash adjustment, see discussion
                  below.
             /(c)/Includes net gains on sales of interests in a domestic
                  pipeline company and certain production properties.
             /(d)/Marine Preservation Association ("MPA") is a non-profit oil
                  spill response group.
             /(e)/Reflected domestic production tax accruals for prior years.
             /(f)/Related to adoption of SFAS No. 121.
             /(g)/Expected recoveries from state governments of expenditures
                  related to underground storage tanks at retail marketing
                  outlets.

                Adjusted income from operations for the Marathon Group increased
             by $143 million in 1997 from 1996, and by $352 million in 1996 from
             1995. The increase in 1997 was due primarily to higher average
             refined product margins and higher worldwide natural gas prices,
             partially offset by reduced worldwide liquid hydrocarbon production
             and prices, increased worldwide exploration expense and increased
             administrative expenses. The increase in 1996 from 1995 was due
             primarily to higher average prices for worldwide liquid
             hydrocarbons and natural gas, reduced DD&A expense and increased
             worldwide volumes of natural gas. These favorable effects were
             partially offset by decreased worldwide liquid hydrocarbon volumes,
             net losses on production hedging activities (primarily occurring in
             the fourth quarter of 1996) and lower refined product margins.
             Reduced DD&A expense resulted mainly from the fourth quarter 1995
             adoption of SFAS No. 121, and property sales.

                                                                            U-49

 
             Management's Discussion and Analysis C O N T I N U E D

                With respect to the IMV reserve adjustment, when U. S. Steel
             Corporation acquired Marathon Oil Company in March 1982, crude oil
             and refined product prices were at historically high levels. In
             applying the purchase method of accounting, Marathon's crude oil
             and refined product inventories were revalued by reference to
             current prices at the time of acquisition. This became the new LIFO
             cost basis of the inventories, which has been maintained since the
             1982 acquisition. Generally accepted accounting principles require
             that inventories be valued at lower of cost or market. Accordingly,
             Marathon has established an IMV reserve to reduce the LIFO cost
             basis of these inventories on a quarterly basis, to the extent
             necessary, to current market value. Adjustments to the IMV reserve
             result in noncash charges or credits to income from operations.
             These adjustments affect the comparability of financial results
             from period to period as well as comparisons with other energy
             companies, which may not have such adjustments. The IMV reserve
             adjustments have been separately reported, on a consistent basis,
             as a component of operating results and separately identified in
             management's discussion of operations.

                Commodity prices have fluctuated widely and, since 1986, have
             generally remained below prices that existed at the time of the
             1982 acquisition, resulting in periodic adjustments to the LIFO
             cost basis of the inventories. At December 31, 1997, LIFO cost
             exceeded market prices by $284 million, resulting in a
             corresponding charge to income from operations for total year 1997.
             During 1996 and 1995, favorable market price movements resulted in
             credits to income from operations of $209 million and $70 million,
             respectively. The $493 million variance in income from operations
             between 1997 and 1996 for the IMV reserve adjustments (and $139
             million variance between 1996 and 1995) affects the comparability
             of reported financial results. In management's opinion, the
             Marathon Group's operating performance should be evaluated
             exclusive of the IMV reserve adjustments, which management believes
             provides a more indicative view of the profit and cash flow
             performance of the Group.

             OUTLOOK-MARATHON GROUP

                The outlook regarding the Marathon Group's sales levels, margins
             and income is largely dependent upon future prices and volumes of
             crude oil, natural gas and refined products. Prices have
             historically been volatile and have frequently been driven by
             unpredictable changes in supply and demand resulting from
             fluctuations in economic activity and political developments in the
             world's major oil and gas producing areas, including OPEC member
             countries. Any substantial decline in such prices could have a
             material adverse effect on the Marathon Group's results of
             operations. A prolonged decline in such prices could also adversely
             affect the quantity of crude oil and natural gas reserves that can
             be economically produced and the amount of capital available for
             exploration and development.

                With respect to Marathon's upstream operations, worldwide liquid
             hydrocarbon volumes are expected to increase by twenty-five percent
             in 1998, with most of the increase anticipated in the second half
             of the year. This primarily reflects projected new production from
             fields in the Gulf of Mexico (such as Green Canyon 244 and Ewing
             Bank Blocks 963 and 917), the Tchatamba Marine field in Gabon and
             the West Brae field in the U.K. North Sea, partially offset by
             natural production declines of mature fields. Marathon's worldwide
             natural gas volumes in 1998 are expected to remain consistent with
             1997 volumes at around 1.2 billion cubic feet per day, as natural
             declines in mature international fields, primarily in Ireland and
             Norway, are anticipated to be offset by anticipated increases in
             domestic production (mainly in the Austin Chalk area in Texas,
             Green Canyon 244 and the Vermillion Basin in Wyoming). These
             projections are based on known discoveries and do not include any
             additions from acquisitions or future exploratory drilling.

                Other major upstream projects which are currently underway or
             under evaluation and are expected to improve future income streams,
             include Viosca Knoll Block 786 and Green Canyon Blocks 112 and 113
             in the Gulf of Mexico, the Tchatamba South field, located offshore
             Gabon, and the Sakhalin II project in the Russian Far East Region
             (discussed below).

U-50

 
             Management's Discussion and Analysis C O N T I N U E D

                The Marathon Group holds a 37.5% interest in Sakhalin Energy, an
             incorporated joint venture company responsible for the overall
             management of the Sakhalin II project. This project includes
             development of the Piltun-Astokhskoye ("P-A") oil field and the
             Lunskoye gas field located offshore Sakhalin Island in the Russian
             Far East Region. During 1997, authorized representatives of the
             Russian Government approved the Development Plan for the P-A
             License Area, Phase 1: Astokh Feature. Appraisal work for the
             remainder of the P-A field was also authorized. The P-A full field
             development plan is scheduled to be completed and submitted to the
             Russian Government by June 1999. First production of oil from the
             Astokh Feature, which will be developed using an arctic-class
             drilling vessel called the Molikpaq, remains on target for the
             summer of 1999. Late in 1997, the Sakhalin Energy consortium
             arranged for a limited recourse project financing facility of $348
             million with a group of international financial institutions.
             Subject to various conditions, initial borrowings by Sakhalin
             Energy under this facility are anticipated in 1998 to partially
             fund Phase 1 expenditure requirements.

                Looking at downstream operations, Marathon and Ashland Inc.
             officially formed MAP, which commenced operations on January 1,
             1998. Major elements of both firms' refining, marketing and
             transportation operations were combined, with Marathon having a 62%
             ownership interest in MAP and Ashland holding a 38% interest. MAP
             has seven refineries with a combined capacity of 935,000 barrels
             per day ("bpd"), 84 light products and asphalt terminals in the
             Midwest and Southeast United States, about 5,400 retail marketing
             outlets in 20 states and significant pipeline holdings. Potential
             efficiencies derived by MAP have been broadly estimated to be in
             excess of $200 million annually on a pretax basis. While a modest
             part of these efficiencies will be achieved in mid- to late 1998,
             full realization of efficiencies should occur over the next few
             years as MAP's integration plans are implemented. In conjunction
             with the formation of MAP, the Marathon Group is expected to
             recognize an estimated $250 million one-time, pretax change-in-
             interest gain in the first quarter of 1998. For additional details
             of the agreements and the one-time financial gain, see Note 31 to
             the USX Consolidated Financial Statements.

                MAP's refined product sales volumes for 1998 are expected to
             increase slightly from 1997 levels of Marathon's and Ashland's
             separate downstream operations, which were a combined volume of
             approximately 1.2 million bpd. A major maintenance shutdown
             ("turnaround") was completed at the Garyville (La.) refinery in
             early 1998, and major turnarounds are planned for the Canton (Ohio)
             refinery in the fourth quarter of 1998, the Catlettsburg (Ky.)
             refinery in the first quarter of 1999 and the Detroit (Mich.)
             refinery in the fourth quarter of 1999. Each turnaround is expected
             to last about one month.

                The above forward-looking statements of projects, expected
             production and sales levels, and dates of initial production are
             based on a number of assumptions, including (among others) prices,
             supply and demand, regulatory constraints, reserve estimates,
             production decline rates for mature fields, reserve replacement
             rates, and geological and operating considerations. In addition,
             development of new production properties in countries outside the
             United States may require protracted negotiations with host
             governments and is frequently subject to political considerations,
             such as tax regulations, which could adversely affect the economics
             of projects. With respect to the Sakhalin II project in Russia,
             Sakhalin Energy continues to seek to have certain Russian laws and
             normative acts at the Russian Federation and local levels brought
             into compliance with the existing Production Sharing Agreement Law.
             To the extent these assumptions prove inaccurate and/or
             negotiations, legal developments and other considerations are not
             satisfactorily resolved, actual results could be materially
             different than present expectations.

                The above discussion also contains forward-looking statements
             with respect to the amount and timing of efficiencies to be
             realized by MAP. Some factors that could potentially cause actual
             results to differ materially from present expectations include
             unanticipated costs to implement shared technology, difficulties in
             integrating corporate structures, delays in leveraging volume
             procurement advantages or delays in personnel rationalization.

             YEAR 2000

                Marathon continues to identify, analyze, modify and/or replace
             non-compliant systems, equipment and other devices that utilize
             date/time-oriented software or computer chips. Marathon has
             contacted all of its vendors from which systems have been purchased
             and has requested that appropriate corrections be provided by mid-
             1998. Modifications to internally developed systems are being
             handled in-house. In addition, during 1997, Marathon began
             including Year 2000 provisions in a variety of its contracts. In
             management's opinion, the incremental costs associated with these
             efforts will not be material to the operating results of the
             Marathon Group.

                                                                            U-51

 
             Management's Discussion and Analysis C O N T I N U E D   
 
                This discussion of Marathon's efforts and management's
             expectations relating to the effect of Year 2000 compliance on
             operating results are forward-looking statements. Actual results
             could be materially different because Marathon's ability to achieve
             Year 2000 compliance and the level of incremental costs associated
             therewith could be adversely affected by unanticipated problems
             identified in the ongoing compliance review. In addition, Marathon
             has limited or no control over comparable corrective actions by
             proprietary software vendors and other entities with which it
             interacts. Therefore, Year 2000 compliance problems experienced by
             these entities could adversely affect the operating results of the
             Marathon Group.

             THE U. S. STEEL GROUP

                The U. S. Steel Group includes U. S. Steel, which is primarily
             engaged in the production and sale of steel mill products, coke and
             taconite pellets. The U. S. Steel Group also includes the
             management of mineral resources, domestic coal mining and
             engineering and consulting services. Other businesses that are part
             of the U. S. Steel Group include real estate development and
             management, and leasing and financing activities.

                U. S. Steel Group REVENUES were $6.9 billion in 1997, as
             compared with $6.7 billion in 1996 and $6.6 billion in 1995. The
             increase in 1997 from 1996 primarily reflected higher average
             realized steel prices and increased shipment volumes. The increase
             in 1996 from 1995 resulted primarily from improved product mix,
             partially offset by lower average steel product prices. Steel
             shipment volumes in 1996 remained at 1995 levels.

                U. S. Steel Group INCOME FROM OPERATIONS and certain items
             included in income from operations for each of the last three years
             are summarized in the following table:



             (Dollars in millions)                                          1997    1996    1995
             -----------------------------------------------------------------------------------
                                                                                  
             Income from operations/(a)/                                   $ 773   $ 483   $ 582
             Less: Certain favorable (unfavorable) items
              Effect of adoption of SOP 96-1/(b)/                            (20)     -       -
              Certain other environmental accrual adjustments  net            11      -       -
               Net gains on certain asset sales/(c)/                          15      -       -
              Gain on affiliate stock offering/(d)/                           -       53      -
              Certain Gary Works blast furnace repairs/(e)/                   -      (39)    (34)
              Employee reorganization charges/(f)/                            -      (13)     -
              Impairment of long-lived assets/(g)/                            -       -      (16)
              Adjustments for certain employee-related costs                  -       -       18
              Certain legal accruals                                          -       -      (44)
                                                                           -----   -----   ----- 
                 Subtotal                                                      6       1     (76)
                                                                           -----   -----   ----- 
                 Income from operations adjusted to exclude above items    $ 767   $ 482   $ 658
             ------------------------------------------------------------------------------------


             /(a)/ Consists of operating income, affiliate income, net gains on
                   disposal of investments, gain on affiliate stock offering and
                   other income. Amounts for 1996 and 1995 were reclassified in
                   1997 to include affiliate income, gain on affiliate stock
                   offering and other income. See Note 9 to the Consolidated
                   Financial Statements for a discussion of operating income.
             /(b)/ American Institute of Certified Public Accountants Statement
                   of Position No. 96-1 "Environmental Remediation Liabilities"
                   provides additional guidance on recognition, measurement and
                   disclosure of remediation liabilities.
             /(c)/ Reflects the sale of the plate mill at the U. S. Steel
                   Group's former Texas Works.
             /(d)/ See Note 8 to the Consolidated Financial Statements.
             /(e)/ Amounts in 1996 and 1995 reflect repair of damages incurred
                   at Gary Works during a hearth break-out at the No. 13 blast
                   furnace on April 2, 1996, and in an explosion at the No. 8
                   blast furnace on April 5, 1995, respectively.
             /(f)/ Related to employee costs associated with work force
                   reduction programs.
             /(g)/ Related to adoption of SFAS No. 121.

U-52

 
             Management's Discussion and Analysis C O N T I N U E D      

                Adjusted income from operations increased by $285 million in
             1997 as compared with 1996, due primarily to increased shipment
             volumes, higher average realized steel prices, improved operating
             efficiencies, and receipt of $40 million in insurance settlements
             related to the 1996 hearth break-out at the Gary Works No. 13 blast
             furnace. These improvements were partially offset by higher 1997
             accruals for profit sharing. Adjusted income from operations
             decreased by $176 million in 1996 from 1995, due primarily to lower
             average prices for steel products, cost inefficiencies and reduced
             shipments related to outages at U. S. Steel's three largest blast
             furnaces including lost sales from the unplanned outage of the No.
             13 blast furnace at Gary Works. These factors were partially offset
             by improved product mix and decreased accruals for profit sharing
             plans.

             OUTLOOK - U. S. STEEL GROUP

                The U. S. Steel Group presently anticipates that steel demand
             will remain relatively strong in 1998, and the outlook remains
             positive for the markets it serves. This market strength is
             dependent on continued strong demand for capital goods, oil and gas
             tubular products and consumer durables in domestic and
             international economies. Based on the continuing strong demand for
             its products, U. S. Steel Group announced in December 1997, price
             increases for plate and tubular products for spot market shipments
             scheduled for delivery after March 28, 1998, for plate and March
             31, 1998, for tubular. In January 1998, price increases were also
             announced for sheet products affecting orders scheduled for
             shipment after April 1, 1998. These increases will not apply to
             shipments under long term contracts where prices were previously
             negotiated. However, growing domestic production for flat-rolled
             products (an estimated 4.6 million tons of additional production
             capability from new and existing sources is expected in 1998),
             continuing high levels of imports and a return to the market of a
             competitor following a lengthy strike, could have an adverse effect
             on U. S. Steel's product prices and shipment levels. In addition,
             uncertainties related to the Asian economies could potentially
             impact the domestic markets, if Asian countries increase their
             level of steel exports to the United States.

                Steel imports to the United States accounted for an estimated
             24%, 23% and 21% of the domestic steel market in the first eleven
             months of 1997, and for the years 1996 and 1995, respectively.
             Steel imports of hot rolled, cold rolled and galvanized sheets as a
             percentage of total finished imports, increased 4% in the first
             eleven months of 1997, compared to the same period in 1996. The
             domestic steel industry has, in the past, been adversely affected
             by unfairly traded imports, and higher levels of imported steel may
             have an adverse effect on product prices, shipment levels and
             results of operations.

                U. S. Steel Group shipments in the first quarter of 1998 are
             expected to be lower than in the fourth quarter of 1997 due to a
             seasonal industry decline in first quarter shipments. During the
             second and third quarters of 1998, raw steel production is expected
             to be reduced by a 100-day planned blast furnace reline at Gary
             Works. U. S. Steel expects to supplement raw steel production with
             the purchase of slabs from outside sources, which should allow it
             to maintain shipment levels during this planned outage.

                On February 5, 1998, U. S. Steel Group and VSZ a.s., Kosice,
             entered into a 50-50 joint venture in Kosice, Slovakia, for the
             production and marketing of tin mill products to serve an emerging
             Central European market. In February 1998, the joint venture, doing
             business as VSZ U. S. Steel, s. r.o., took ownership and commenced
             operations of an existing tin mill facility (VSZ's Ocel plant in
             Kosice) with an annual production capacity of 140,000 metric tons.
             The joint venture plans to add 200,000 annual metric tons of new
             tin mill production capacity in the next two years.

                In 1997, U. S. Steel Group, through a subsidiary, United States
             Steel Export Company de Mexico, along with Feralloy Mexico, S.R.L.
             de C.V., and Intacero de Mexico, S.A. de C.V., formed a joint
             venture for a slitting and warehouse facility in San Luis Potosi,
             Mexico. The joint venture will conduct business as Acero Prime and
             will service primarily the appliance industry. Construction will
             begin in 1998 with operations commencing in early 1999.

                The preceding statements concerning anticipated steel demand,
             steel pricing, purchasing slabs to supplement raw steel production
             and shipment levels are forward-looking and are based upon
             assumptions as to future product prices and mix, and levels of
             steel production capability, production and shipments. These
             forward-looking statements can be affected by imports, domestic and
             international economies, domestic production capacity, availability
             of slabs, and customer demand. In the event these assumptions prove
             to be inaccurate, actual results may differ significantly from
             those presently anticipated.

                                                                            U-53

 
             Management's Discussion and Analysis C O N T I N U E D      

             YEAR 2000

                A task force has been established to identify all potential
             areas of risk and to make any required modifications as they relate
             to business computer systems, technical infrastructure, end-user
             computing, business partners, manufacturing, environmental
             operations, systems products produced and sold, and dedicated R&D
             test facilities. A Year 2000 impact assessment for all of the
             aforementioned areas is expected to be completed by the end of
             first quarter 1998. The U. S. Steel Group technical software
             infrastructure for mainframe computers is essentially Year 2000
             compliant; however, vendor software and other computing platforms
             are still in the process of being analyzed for compliance. The U.
             S. Steel Group is monitoring the compliance efforts of the entities
             with which it does business, and is participating with steel
             industry and other trade associations to collectively address Year
             2000 issues involving such entities. The U. S. Steel Group's
             objective is to achieve compliance by the end of 1998, and to use
             the year 1999 to validate and confirm Year 2000 compliance,
             including continued monitoring of progress by the U. S. Steel
             Group's business partners. Based on information available at this
             time, management believes that the incremental costs associated
             with achieving Year 2000 compliance will not be material to the
             operating results of the U. S. Steel Group.

                The discussion of the U. S. Steel Group's efforts, and
             management's expectations, relating to Year 2000 compliance are
             forward-looking statements. The U. S. Steel Group's ability to
             achieve Year 2000 compliance and the level of incremental costs
             associated therewith, could be adversely impacted by, among other
             things, the availability and cost of programming and testing
             resources, vendors' ability to modify proprietary software and
             unanticipated problems identified in the ongoing compliance review.
             The U. S. Steel Group has limited or no control over the actions of
             proprietary software vendors and other entities with which it
             interacts. Therefore, Year 2000 compliance problems experienced by
             these entities could adversely affect the operating results of the
             U. S. Steel Group.

             THE DELHI GROUP

                Effective October 31, 1997, USX sold Delhi Gas Pipeline
             Corporation and other subsidiaries of USX that comprise all of the
             Delhi Group.

U-54

 
             Quantitative and Qualitative Disclosures About Market Risk

             MANAGEMENT OPINION CONCERNING DERIVATIVE INSTRUMENTS

                USX employs a strategic approach of limiting its use of
             derivative instruments principally to hedging activities, whereby
             gains and losses are generally offset by price changes in the
             underlying commodity. Based on this approach, combined with risk
             assessment procedures and internal controls, management believes
             that its use of derivative instruments does not expose USX to
             material risk. USX's use of derivative instruments for hedging
             activities could materially affect USX's results of operations in
             particular quarterly or annual periods. This is primarily because
             use of such instruments may limit the company's ability to benefit
             from favorable price movements. However, management believes that
             use of these instruments will not have a material adverse effect on
             financial position or liquidity. For a summary of accounting
             policies related to derivative instruments, see Note 1 to the
             Consolidated Financial Statements.

             COMMODITY PRICE RISK AND RELATED RISKS

                In the normal course of its business, USX is exposed to market
             risk, or price fluctuations related to the purchase, production or
             sale of crude oil, natural gas, refined products and steel
             products. To a lesser extent, USX is exposed to the risk of price
             fluctuations on coal, coke, natural gas liquids, electricity,
             petroleum feedstocks and certain nonferrous metals used as raw
             materials. USX is also exposed to effects of price fluctuations on
             the value of its commodity inventories.

                USX's market risk strategy has generally been to obtain
             competitive prices for its products and services and allow
             operating results to reflect market price movements dictated by
             supply and demand. However, USX uses fixed-price contracts and
             derivative commodity instruments to manage a relatively small
             portion of its commodity price risk. USX uses fixed-price contracts
             for portions of its natural gas production to manage exposure to
             fluctuations in natural gas prices. In addition, USX uses
             derivative commodity instruments such as exchange-traded futures
             contracts and options, and over-the-counter ("OTC") commodity swaps
             and options to manage exposure to market risk related to the
             purchase, production or sale of crude oil, natural gas, refined
             products, certain nonferrous metals and electricity. USX's
             strategic approach is to limit the use of these instruments
             principally to hedging activities. Accordingly, gains and losses on
             derivative commodity instruments are generally offset by the
             effects of price changes in the underlying commodity. However,
             certain derivative commodity instruments have the effect of
             restoring the equity portion of fixed-price sales of natural gas to
             variable market-based pricing. These instruments are used as part
             of USX's overall risk management programs.

                                                                            U-55

 
             Quantitative Qualitative Disclosures
             About Market Risk CONTINUED                      

                Sensitivity analyses of the incremental effects on pretax income
             of hypothetical 10% and 25% changes in commodity prices for open
             derivative commodity instruments as of December 31, 1997, are
             provided in the following table:/(a)/

                                                   
                                                 
             (Dollars in millions)                                     
             --------------------------------------------------------------------------------------------
                                                                            INCREMENTAL DECREASE IN           
                                                                            PRETAX INCOME ASSUMING A          
                                                                        HYPOTHETICAL PRICE CHANGE OF/(a)/ 
             DERIVATIVE COMMODITY INSTRUMENTS                                10%                25%                 
            ---------------------------------------------------------------------------------------------
                                                                                           
             Marathon Group/(b)(c)/:                                   
              Crude oil (price increase)/(d)/                               $2.7               $ 8.6   
              Natural gas (price decrease)/(d)/                              2.9                 7.1
              Refined products (price decrease)/(d)/                          .4                 1.1
                                                                            ----               -----
               Total                                                        $6.0               $16.8
                                                                       
             U. S. Steel Group:                                        
              Natural gas (price decrease)/(d)/                             $1.1               $ 2.8    
             --------------------------------------------------------------------------------------------


             /(a)/ Gains and losses on derivative commodity instruments are
                   generally offset by price changes in the underlying
                   commodity. Effects of these offsets are not reflected in the
                   sensitivity analyses. Amounts reflect the estimated
                   incremental effect on pretax income of hypothetical 10% and
                   25% changes in closing commodity prices for each open
                   contract position at December 31, 1997. Marathon Group and U.
                   S. Steel Group management evaluate their portfolios of
                   derivative commodity instruments on an ongoing basis and add
                   or revise strategies to reflect anticipated market conditions
                   and changes in risk profiles. Changes to the portfolios
                   subsequent to December 31, 1997, would cause future pretax
                   income effects to differ from those presented in the table.

             /(b)/ The number of net open contracts varied throughout 1997, from
                   a low of 637 contracts at December 31, to a high of 9,307
                   contracts at June 11, and averaged 5,400 for the year. The
                   derivative commodity instruments used and hedging positions
                   taken also varied throughout 1997, and will continue to vary
                   in the future. Because of these variations in the composition
                   of the portfolio over time, the number of open contracts, by
                   itself, cannot be used to predict future income effects.
                   During 1998, the size of the portfolio is expected to
                   increase above average 1997 levels as a result of increased
                   volumes for Marathon Ashland Petroleum LLC, on a basis
                   consistent with guidelines established in previously existing
                   downstream hedging programs. 

             /(c)/ The calculation of sensitivity amounts for basis swaps
                   assumes that the physical and paper indices are perfectly
                   correlated. Gains and losses on options are based on the
                   difference between the strike price and the underlying
                   commodity price.

             /(d)/ The direction of the price change used in calculating the
                   sensitivity amount for each commodity reflects that which
                   would result in the largest incremental decrease in pretax
                   income when applied to the derivative commodity instruments
                   used to hedge that commodity.

                While derivative commodity instruments are generally used to
             reduce risks from unfavorable commodity price movements, they also
             may limit the opportunity to benefit from favorable movements.
             During the fourth quarter of 1996, certain hedging strategies
             matured which limited the Marathon Group's ability to benefit from
             favorable market price increases on the sales of equity crude oil
             and natural gas production, resulting in pretax hedging losses of
             $33 million. In total, Marathon's upstream operations recorded net
             pretax hedging losses of $3 million in 1997, compared with net
             losses of $38 million in 1996, and net gains of $10 million in
             1995.

                Marathon's downstream operations generally use derivative
             commodity instruments to lock-in costs of certain raw material
             purchases, to protect carrying values of inventories and to protect
             margins on fixed-price sales of refined products. In total,
             Marathon's downstream operations recorded net pretax hedging gains
             of $29 million in 1997, compared with net losses of $22 million in
             1996 and $4 million in 1995. Essentially, all of these upstream and
             downstream gains and losses were offset by changes in the prices of
             the underlying hedged commodities, with the net effect
             approximating the targeted results of the hedging strategies.

                The U. S. Steel Group uses OTC commodity swaps to manage
             exposure to market risk related to the purchase of natural gas used
             as a raw material. The U. S. Steel Group recorded net pretax
             hedging gains of $5 million in 1997, compared with pretax gains of
             $21 million in 1996 and pretax losses of $15 million in 1995. These
             gains and losses were offset by changes in the realized prices of
             the underlying hedged natural gas.

                For additional quantitative information relating to derivative
             commodity instruments, including aggregate contract values and fair
             values, where appropriate, see Note 28 to the Consolidated
             Financial Statements.

U-56

 
             Quantitative Qualitative Disclosures
             About Market Risk CONTINUED                      

                USX is subject to basis risk, caused by factors that affect the
             relationship between commodity futures prices reflected in
             derivative commodity instruments and the cash market price of the
             underlying commodity. Natural gas transaction prices are frequently
             based on industry reference prices that may vary from prices
             experienced in local markets. For example, New York Mercantile
             Exchange ("NYMEX") contracts for natural gas are priced at
             Louisiana's Henry Hub, while the underlying quantities of natural
             gas may be produced and sold in the Western United States at prices
             that do not move in strict correlation with NYMEX prices. To the
             extent that commodity price changes in one region are not reflected
             in other regions, derivative commodity instruments may no longer
             provide the expected hedge, resulting in increased exposure to
             basis risk. These regional price differences could yield favorable
             or unfavorable results. OTC transactions are being used to manage
             exposure to a portion of basis risk.

                USX is subject to liquidity risk, caused by timing delays in
             liquidating contract positions due to a potential inability to
             identify a counterparty willing to accept an offsetting position.
             Due to the large number of active participants, liquidity risk
             exposure is relatively low for exchange-traded transactions.

             INTEREST RATE RISK

                USX is subject to the effects of interest rate fluctuations on
             certain of its non-derivative financial instruments. A sensitivity
             analysis of the projected incremental effect of a hypothetical 10%
             decrease in year-end 1997 interest rates on the fair value of USX's
             non-derivative financial instruments, is provided in the following
             table:



             (Dollars in millions)
             -------------------------------------------------------------------------------------------------------
                                                                                                       Incremental
                                                                                                       Increase in
                                                                              Carrying       Fair           Fair
             Non-Derivative Financial Instruments/(a)/                       Value  (b)  Value  /(b)/  Value  /(c)/
                                                                                                
             Financial assets:
              Investments and long-term receivables/(d)/                          $120        $   177       $     -
 
             Financial liabilities:
              Long-term debt (including amounts due within one year)/(e)/       $3,281        $ 3,646       $   117
              Preferred stock of subsidiary/(f)/                                   250            254            24
              USX obligated mandatorily redeemable convertible preferred
               securities of a subsidiary trust/(g)/                               182            181            17
                                                                                ------        -------       -------
              Total                                                             $3,713        $ 4,081       $   158
             -------------------------------------------------------------------------------------------------------


             /(a)/ Fair values of cash and cash equivalents, cash restricted for
                   redemption of Delhi Stock, receivables, notes payable,
                   accounts payable and accrued interest, approximate carrying
                   value and are relatively insensitive to changes in interest
                   rates due to the short-term maturity of the instruments.
                   Accordingly, these instruments are excluded from the table.

             /(b)/ At December 31, 1997. For additional discussion, see Note
                   29 to the Consolidated Financial Statements.

             /(c)/ Reflects, by class of financial instrument, the estimated
                   incremental effect of a hypothetical 10% decrease in interest
                   rates at December 31, 1997, on the fair value of USX's non-
                   derivative financial instruments. For financial liabilities,
                   this assumes a 10% decrease in the weighted average yield to
                   maturity of USX's long-term debt at December 31, 1997.

             /(d)/ For additional information, see Note 14 to the Consolidated
                   Financial Statements.

             /(e)/ Fair value was based on market prices where available, or
                   current borrowing rates for financings with similar terms and
                   maturities. For additional information, see Note 16 to the
                   Consolidated Financial Statements.

             /(f)/ In 1994, USX Capital LLC, a wholly owned subsidiary of USX,
                   sold 10,000,000 shares of 8-3/4% Cumulative Monthly Income
                   Preferred Shares. For further discussion, see Note 25 to the
                   Consolidated Financial Statements.

             /(g)/ In 1997, USX exchanged 3.9 million 6.75% Convertible
                   Quarterly Income Preferred Securities of USX Capital Trust I,
                   a Delaware statutory business trust, for an equivalent number
                   of shares of its 6.50% Cumulative Convertible Preferred
                   Stock. For further discussion, see Note 26 to the
                   Consolidated Financial Statements.

                At December 31, 1997, USX's portfolio of long-term debt was
             comprised primarily of fixed-rate instruments. Therefore, the fair
             value of the portfolio is relatively sensitive to effects of
             interest rate fluctuations. This sensitivity is illustrated by the
             $117 million increase in the fair value of long-term debt assuming
             a hypothetical 10% decrease in interest rates. However, USX's
             sensitivity to interest rate declines and corresponding increases
             in the fair value of its debt portfolio would unfavorably affect
             USX's results and cash flows only to the extent that USX elected to
             repurchase or otherwise retire all or a portion of its fixed-rate
             debt portfolio at prices above carrying value.

                                                                            U-57

 
             Quantitative Qualitative Disclosures
             About Market Risk CONTINUED                      

             FOREIGN CURRENCY EXCHANGE RATE RISK

                USX is subject to the risk of price fluctuations related to
             anticipated revenues and operating costs, firm commitments for
             capital expenditures and existing assets or liabilities denominated
             in currencies other than U.S. dollars. USX has not generally used
             derivative instruments to manage this risk. However, USX has made
             limited use of forward currency contracts to manage exposure to
             certain currency price fluctuations. 

                At December 31, 1997, a forward currency contract with a fair
             value of $10 million was outstanding. This contract hedges exposure
             to currency price fluctuations relating to a Swiss franc debt
             obligation with a fair value of $69 million at December 31, 1997.
             The debt obligation and forward contract mature in 1998.

             EQUITY PRICE RISK

                USX is subject to equity price risk resulting from its issuance
             in December 1996 of $117 million of 6 3/4% Exchangeable Notes Due
             February 1, 2000 ("Indexed Debt"). At maturity, USX must exchange
             the notes for shares of RMI Titanium Company ("RMI") common stock,
             or redeem the notes for the equivalent amount of cash. Each
             quarter, USX adjusts the carrying value of Indexed Debt to
             settlement value, based on changes in the value of RMI common
             stock. Any resulting adjustment is charged or credited to income
             and included in interest and other financial costs. During 1997,
             USX recorded adjustments of $16 million favorable in the first
             quarter, $10 million unfavorable in the second quarter and $4
             million favorable in the fourth quarter. At year-end 1997, a
             hypothetical 10% increase in the value of RMI common stock would
             have resulted in a $4 million unfavorable effect on pretax income.
             USX holds a 27% interest in RMI which is accounted for under the
             equity method. At December 31, 1997, this investment in RMI common
             stock had a fair market value of $110 million and a carrying value
             of $56 million. The unfavorable effects on income described above
             would generally be offset by changes in the market value of USX's
             investment in RMI. However, under the equity method of accounting,
             USX cannot recognize in income these changes in the market value
             until the investment is liquidated.

                The Marathon Group holds investments in common stock and
             warrants of certain third parties. The fair value of these
             investments has not been material.

             SAFE HARBOR

                USX's quantitative and qualitative disclosures about market risk
             include forward-looking statements as defined in the Private
             Securities Litigation Reform Act of 1995. These statements are
             accompanied by cautionary language identifying important factors
             (particularly the underlying assumptions and limitations disclosed
             in footnotes to the tables), though not necessarily all such
             factors, that could cause future outcomes to differ materially from
             those projected.

                Forward-looking statements with respect to management's opinion
             about risks associated with USX's use of derivative instruments,
             and projected increases in the size of the Marathon Group's hedge
             portfolio are based on certain assumptions with respect to market
             prices and industry supply of and demand for crude oil, refined
             products, steel products and certain raw materials. To the extent
             that these assumptions prove to be inaccurate, future outcomes with
             respect to USX's hedging programs may differ materially from those
             discussed in the forward-looking statements.

U-58