<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 QUARTERLY REPORT ON FORM 10-Q AND IS QUALIFIED IN ITS ENTIRETY BY SUCH QUARTERLY REPORT ON FORM 10-Q. </LEGEND> <MULTIPLIER> 1,000 <PERIOD-TYPE> 9-MOS <FISCAL-YEAR-END> DEC-31-1998 <PERIOD-END> SEP-30-1998 <CASH> $29,177 <SECURITIES> $0 <RECEIVABLES> $133,682 <ALLOWANCES> $2,706 <INVENTORY> $116,414 <CURRENT-ASSETS> $295,460 <PP&E> $1,235,875 <DEPRECIATION> $730,797 <TOTAL-ASSETS> $904,239 <CURRENT-LIABILITIES> $117,732 <BONDS> $0 <PREFERRED-MANDATORY> $0 <PREFERRED> $0 <COMMON> $470 <OTHER-SE> $431,870 <TOTAL-LIABILITY-AND-EQUITY> $904,239 <SALES> $615,444 <TOTAL-REVENUES> $615,444 <CGS> $423,936 <TOTAL-COSTS> $524,812 <OTHER-EXPENSES> $0 <LOSS-PROVISION> $0 <INTEREST-EXPENSE> $2,303 <INCOME-PRETAX> $89,908 <INCOME-TAX> $27,871 <INCOME-CONTINUING> $62,037 <DISCONTINUED> $0 <EXTRAORDINARY> $0 <CHANGES> $0 <NET-INCOME> $62,037 <EPS-PRIMARY> $1.17 <EPS-DILUTED> $1.16