<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>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               MAR-31-1996
<CASH>                                        $329,693
<SECURITIES>                                        $0
<RECEIVABLES>                                 $158,916
<ALLOWANCES>                                    $1,769
<INVENTORY>                                    $86,055
<CURRENT-ASSETS>                              $595,029
<PP&E>                                      $1,095,340
<DEPRECIATION>                                $614,569
<TOTAL-ASSETS>                              $1,165,485
<CURRENT-LIABILITIES>                         $252,773
<BONDS>                                             $0
<PREFERRED-MANDATORY>                               $0
<PREFERRED>                                         $0
<COMMON>                                          $661
<OTHER-SE>                                    $730,387
<TOTAL-LIABILITY-AND-EQUITY>                $1,165,485
<SALES>                                       $270,171
<TOTAL-REVENUES>                              $270,171
<CGS>                                         $196,060
<TOTAL-COSTS>                                 $236,731
<OTHER-EXPENSES>                                    $0
<LOSS-PROVISION>                                    $0
<INTEREST-EXPENSE>                              $1,841
<INCOME-PRETAX>                               $191,523
<INCOME-TAX>                                   $75,899
<INCOME-CONTINUING>                           $115,624
<DISCONTINUED>                                      $0
<EXTRAORDINARY>                                     $0
<CHANGES>                                           $0
<NET-INCOME>                                  $115,624
<EPS-PRIMARY>                                    $1.73
<EPS-DILUTED>                                    $1.73