<ARTICLE>               5
<LEGEND>
The schedule contains summary financial information extracted from the condensed
balance sheet as of September 30, 1996 and the condensed statement of income for
the nine months ended September 30, 1996 and is qualified in its entirety by
reference to such financial statements.
</LEGEND>
<MULTIPLIER>                                      1000
       
                                                
<PERIOD-TYPE>                                    9-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               SEP-30-1996
<CASH>                                           6,709
<SECURITIES>                                    15,500
<RECEIVABLES>                                  181,981
<ALLOWANCES>                                     8,522
<INVENTORY>                                    104,279
<CURRENT-ASSETS>                               342,165
<PP&E>                                       1,922,896
<DEPRECIATION>                                 844,004
<TOTAL-ASSETS>                               1,806,469
<CURRENT-LIABILITIES>                          232,329
<BONDS>                                        364,054
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        37,122
<OTHER-SE>                                     633,638
<TOTAL-LIABILITY-AND-EQUITY>                 1,806,469
<SALES>                                        885,363
<TOTAL-REVENUES>                               900,797
<CGS>                                          717,409
<TOTAL-COSTS>                                  717,409
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              25,655
<INCOME-PRETAX>                                 75,366
<INCOME-TAX>                                    28,330
<INCOME-CONTINUING>                             48,086
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    48,086
<EPS-PRIMARY>                                     1.06
<EPS-DILUTED>                                     1.06