<ARTICLE> 5 <MULTIPLIER> 1,000 <PERIOD-TYPE> 6-MOS <FISCAL-YEAR-END> DEC-31-1995 <PERIOD-END> JUN-30-1995 <CASH> 82,935 <SECURITIES> 0 <RECEIVABLES> 111,529 <ALLOWANCES> 588 <INVENTORY> 46,866 <CURRENT-ASSETS> 242,555 <PP&E> 671,206 <DEPRECIATION> 311,874 <TOTAL-ASSETS> 643,585 <CURRENT-LIABILITIES> 195,600 <BONDS> 200,000 <COMMON> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <OTHER-SE> 240,417 <TOTAL-LIABILITY-AND-EQUITY> 643,585 <SALES> 402,469 <TOTAL-REVENUES> 402,469 <CGS> 237,970 <TOTAL-COSTS> 237,970 <OTHER-EXPENSES> 35,457 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 8,801 <INCOME-PRETAX> 120,241 <INCOME-TAX> 0 <INCOME-CONTINUING> 120,241 <DISCONTINUED> 0 <EXTRAORDINARY> 6,912 <CHANGES> 0 <NET-INCOME> 113,329 <EPS-PRIMARY> 3.05 <EPS-DILUTED> 0