<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>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               JUN-30-1996
<CASH>                                         $44,292
<SECURITIES>                                        $0
<RECEIVABLES>                                 $154,972
<ALLOWANCES>                                    $2,009
<INVENTORY>                                    $89,663
<CURRENT-ASSETS>                              $305,450
<PP&E>                                      $1,105,846
<DEPRECIATION>                                $626,279
<TOTAL-ASSETS>                                $873,649
<CURRENT-LIABILITIES>                         $178,374
<BONDS>                                             $0
<PREFERRED-MANDATORY>                               $0
<PREFERRED>                                         $0
<COMMON>                                          $564
<OTHER-SE>                                    $513,514
<TOTAL-LIABILITY-AND-EQUITY>                  $873,649
<SALES>                                       $466,210
<TOTAL-REVENUES>                              $466,210
<CGS>                                         $335,326
<TOTAL-COSTS>                                 $412,387
<OTHER-EXPENSES>                                    $0
<LOSS-PROVISION>                                    $0
<INTEREST-EXPENSE>                              $2,044
<INCOME-PRETAX>                               $213,488
<INCOME-TAX>                                   $83,299
<INCOME-CONTINUING>                           $130,259
<DISCONTINUED>                                      $0
<EXTRAORDINARY>                                     $0
<CHANGES>                                           $0
<NET-INCOME>                                  $130,259
<EPS-PRIMARY>                                    $2.10
<EPS-DILUTED>                                    $2.10