<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM
FORM 10-Q AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER>                        1,000
       
                                   
<PERIOD-TYPE>                       9-MOS
<FISCAL-YEAR-END>             DEC-31-1997
<PERIOD-END>                  SEP-30-1997
<CASH>                              17301
<SECURITIES>                            0
<RECEIVABLES>                      144360
<ALLOWANCES>                            0
<INVENTORY>                         69645
<CURRENT-ASSETS>                   274660
<PP&E>                            1821734
<DEPRECIATION>                     690726
<TOTAL-ASSETS>                    1685984
<CURRENT-LIABILITIES>              215059
<BONDS>                                 0
<PREFERRED-MANDATORY>                   0
<PREFERRED>                             0
<COMMON>                              397
<OTHER-SE>                         594114
<TOTAL-LIABILITY-AND-EQUITY>      1685984
<SALES>                            706210
<TOTAL-REVENUES>                   722725
<CGS>                              629665
<TOTAL-COSTS>                      710584
<OTHER-EXPENSES>                        0
<LOSS-PROVISION>                        0
<INTEREST-EXPENSE>                  12910
<INCOME-PRETAX>                        51
<INCOME-TAX>                         9100
<INCOME-CONTINUING>                  9151
<DISCONTINUED>                          0
<EXTRAORDINARY>                         0
<CHANGES>                               0
<NET-INCOME>                         9151
<EPS-PRIMARY>                         .34
<EPS-DILUTED>                         .34