<ARTICLE> 5 <LEGEND> THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM THE CONSOLIDATED BALANCE SHEET AND THE CONSOLIDATED STATEMENT OF INCOME FILED AS PART OF THE ANNUAL REPORT ON FORM 10-Q AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH ANNUAL REPORT ON FORM 10-Q. </LEGEND> <MULTIPLIER> 1,000 <PERIOD-TYPE> 6-MOS <FISCAL-YEAR-END> DEC-31-1996 <PERIOD-END> JUN-30-1996 <CASH> $44,292 <SECURITIES> $0 <RECEIVABLES> $154,972 <ALLOWANCES> $2,009 <INVENTORY> $89,663 <CURRENT-ASSETS> $305,450 <PP&E> $1,105,846 <DEPRECIATION> $626,279 <TOTAL-ASSETS> $873,649 <CURRENT-LIABILITIES> $178,374 <BONDS> $0 <PREFERRED-MANDATORY> $0 <PREFERRED> $0 <COMMON> $564 <OTHER-SE> $513,514 <TOTAL-LIABILITY-AND-EQUITY> $873,649 <SALES> $466,210 <TOTAL-REVENUES> $466,210 <CGS> $335,326 <TOTAL-COSTS> $412,387 <OTHER-EXPENSES> $0 <LOSS-PROVISION> $0 <INTEREST-EXPENSE> $2,044 <INCOME-PRETAX> $213,488 <INCOME-TAX> $83,299 <INCOME-CONTINUING> $130,259 <DISCONTINUED> $0 <EXTRAORDINARY> $0 <CHANGES> $0 <NET-INCOME> $130,259 <EPS-PRIMARY> $2.10 <EPS-DILUTED> $2.10