<ARTICLE> 5 <MULTIPLIER> 1,000 <PERIOD-TYPE> 6-MOS <FISCAL-YEAR-END> DEC-31-1998 <PERIOD-START> JAN-01-1998 <PERIOD-END> JUN-30-1998 <CASH> 61,841 <SECURITIES> 0 <RECEIVABLES> 731,841 <ALLOWANCES> 18,551 <INVENTORY> 189,295 <CURRENT-ASSETS> 1,067,818 <PP&E> 4,283,167 <DEPRECIATION> 2,551,360 <TOTAL-ASSETS> 3,746,972 <CURRENT-LIABILITIES> 826,755 <BONDS> 957,674 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 320,962 <OTHER-SE> 1,057,441 <TOTAL-LIABILITY-AND-EQUITY> 3,746,972 <SALES> 2,304,979 <TOTAL-REVENUES> 2,304,979 <CGS> 1,846,172 <TOTAL-COSTS> 2,119,821 <OTHER-EXPENSES> 147,537 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> (39,636) <INCOME-PRETAX> 293,059 <INCOME-TAX> 110,049 <INCOME-CONTINUING> 183,010 <DISCONTINUED> (80,067) <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 102,943 <EPS-PRIMARY> 0.72 <EPS-DILUTED> 0.71