<ARTICLE>                     5
       
                                              
<PERIOD-TYPE>                      12-MOS           3-MOS
<FISCAL-YEAR-END>                  DEC-31-1997      DEC-31-1997
<PERIOD-END>                       DEC-31-1997      MAR-31-1997
<CASH>                                  52,300           28,900
<SECURITIES>                                 0                0
<RECEIVABLES>                           60,400           76,800
<ALLOWANCES>                                 0                0
<INVENTORY>                             38,300           43,700
<CURRENT-ASSETS>                        19,700           17,900
<PP&E>                                 428,600          424,100
<DEPRECIATION>                         226,400          221,800
<TOTAL-ASSETS>                         477,900          476,500
<CURRENT-LIABILITIES>                   58,000           69,700
<BONDS>                                 87,400           90,600
<PREFERRED-MANDATORY>                        0                0
<PREFERRED>                                  0                0
<COMMON>                                 4,200            4,200
<OTHER-SE>                             273,500          249,200
<TOTAL-LIABILITY-AND-EQUITY>           477,900          476,500
<SALES>                                452,500          114,700
<TOTAL-REVENUES>                       452,500          114,700
<CGS>                                  320,400           82,000
<TOTAL-COSTS>                          320,400           82,000
<OTHER-EXPENSES>                       (1,100)            (300)
<LOSS-PROVISION>                             0                0
<INTEREST-EXPENSE>                       5,600            1,400
<INCOME-PRETAX>                         57,400           13,600
<INCOME-TAX>                            13,300            5,200
<INCOME-CONTINUING>                     44,400            8,400
<DISCONTINUED>                               0                0
<EXTRAORDINARY>                              0                0
<CHANGES>                                    0                0
<NET-INCOME>                            44,400            8,400
<EPS-PRIMARY>                             2.69              .51
<EPS-DILUTED>                             2.68              .51