<ARTICLE> 5
<MULTIPLIER> 1,000

                                         
<PERIOD-TYPE>                               6-MOS
<FISCAL-YEAR-END>                                           NOV-30-1999
<PERIOD-END>                                                MAY-31-1999
<CASH>                                                           21,100
<SECURITIES>                                                      6,900
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<ALLOWANCES>                                                          0
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<PP&E>                                                        1,215,200
<DEPRECIATION>                                                  720,600
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<CURRENT-LIABILITIES>                                           456,400
<BONDS>                                                               0
<COMMON>                                                          4,200
<PREFERRED-MANDATORY>                                                 0
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<TOTAL-REVENUES>                                                954,500
<CGS>                                                           742,500
<TOTAL-COSTS>                                                   869,000
<OTHER-EXPENSES>                                                (9,500)
<LOSS-PROVISION>                                                      0
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<INCOME-TAX>                                                     34,400
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<CHANGES>                                                             0
<NET-INCOME>                                                     49,700
<EPS-BASIC>                                                      1.19
<EPS-DILUTED>                                                      1.18