<ARTICLE> 5 <MULTIPLIER> 1,000 <PERIOD-TYPE> 3-MOS <FISCAL-YEAR-END> DEC-31-1997 <PERIOD-START> APR-01-1997 <PERIOD-END> JUN-30-1997 <CASH> 122,198 <SECURITIES> 12,975 <RECEIVABLES> 157,227 <ALLOWANCES> 0 <INVENTORY> 52,983 <CURRENT-ASSETS> 448,840 <PP&E> 893,992 <DEPRECIATION> 460,634 <TOTAL-ASSETS> 1,167,124 <CURRENT-LIABILITIES> 311,527 <BONDS> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 82,198 <OTHER-SE> 652,513 <TOTAL-LIABILITY-AND-EQUITY> 1,167,124 <SALES> 440,347 <TOTAL-REVENUES> 440,347 <CGS> 193,281 <TOTAL-COSTS> 378,279 <OTHER-EXPENSES> (3,474) <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 2,487 <INCOME-PRETAX> 63,055 <INCOME-TAX> 25,598 <INCOME-CONTINUING> 0 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 37,457 <EPS-PRIMARY> .46 <EPS-DILUTED> 0