<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM CONDENSED
CONSOLIDATED BALANCE SHEETS AND FROM CONSOLIDATED STATEMENTS OF EARNINGS AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               MAR-31-1997
<CASH>                                           8,156
<SECURITIES>                                         0
<RECEIVABLES>                                  557,591
<ALLOWANCES>                                         0
<INVENTORY>                                    309,135
<CURRENT-ASSETS>                               907,881
<PP&E>                                       3,201,387
<DEPRECIATION>                             (1,504,018)
<TOTAL-ASSETS>                               2,836,054
<CURRENT-LIABILITIES>                          702,482
<BONDS>                                        583,200
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        15,609
<OTHER-SE>                                   1,264,618
<TOTAL-LIABILITY-AND-EQUITY>                 2,836,054
<SALES>                                      1,114,068
<TOTAL-REVENUES>                             1,119,443
<CGS>                                          878,116
<TOTAL-COSTS>                                   87,927
<OTHER-EXPENSES>                                85,311
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               9,605
<INCOME-PRETAX>                                 58,484
<INCOME-TAX>                                    19,334
<INCOME-CONTINUING>                             39,150
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    39,150
<EPS-PRIMARY>                                     1.25
<EPS-DILUTED>                                        0