<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>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               SEP-30-1996
<CASH>                                         $39,326
<SECURITIES>                                        $0
<RECEIVABLES>                                 $138,931
<ALLOWANCES>                                    $1,191
<INVENTORY>                                    $73,766
<CURRENT-ASSETS>                              $269,696
<PP&E>                                      $1,126,647
<DEPRECIATION>                                $638,680
<TOTAL-ASSETS>                                $846,252
<CURRENT-LIABILITIES>                         $157,260
<BONDS>                                             $0
<PREFERRED-MANDATORY>                               $0
<PREFERRED>                                         $0
<COMMON>                                          $550
<OTHER-SE>                                    $493,151
<TOTAL-LIABILITY-AND-EQUITY>                  $846,252
<SALES>                                       $649,986
<TOTAL-REVENUES>                              $649,986
<CGS>                                         $474,342
<TOTAL-COSTS>                                 $585,095
<OTHER-EXPENSES>                                    $0
<LOSS-PROVISION>                                    $0
<INTEREST-EXPENSE>                              $2,367
<INCOME-PRETAX>                               $224,504
<INCOME-TAX>                                   $86,358
<INCOME-CONTINUING>                           $138,146
<DISCONTINUED>                                      $0
<EXTRAORDINARY>                                     $0
<CHANGES>                                           $0
<NET-INCOME>                                  $138,146
<EPS-PRIMARY>                                    $2.30
<EPS-DILUTED>                                    $2.30