<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from the
condensed consolidated balance sheet and the condensed statements of earnings at
the date and for the period indicated and is qualified in its entirety by
reference to such financial statements. All amounts shown are in thousands of
dollars, except per share data.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          MAR-31-1996
<PERIOD-START>                             APR-01-1995
<PERIOD-END>                               DEC-31-1995
<CASH>                                          10,234
<SECURITIES>                                         0
<RECEIVABLES>                                  141,312
<ALLOWANCES>                                    10,166
<INVENTORY>                                     32,311
<CURRENT-ASSETS>                               178,429
<PP&E>                                       1,453,891
<DEPRECIATION>                                 882,941
<TOTAL-ASSETS>                                 847,534
<CURRENT-LIABILITIES>                           82,632
<BONDS>                                          5,000
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                         5,334
<OTHER-SE>                                     616,469
<TOTAL-LIABILITY-AND-EQUITY>                   847,534
<SALES>                                        435,939
<TOTAL-REVENUES>                               435,939
<CGS>                                          354,448
<TOTAL-COSTS>                                  354,448
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               4,183
<INCOME-PRETAX>                                 88,450
<INCOME-TAX>                                    29,188
<INCOME-CONTINUING>                             59,262
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    59,262
<EPS-PRIMARY>                                     1.10
<EPS-DILUTED>                                     1.10