<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED CONDENSED BALANCE SHEET AS OF MAY 31, 1997 AND THE CONSOLIDATED
CONDENSED STATEMENT OF OPERATIONS FOR THE NINE MONTHS ENDED MAY 31, 1997 AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          AUG-31-1997
<PERIOD-END>                               MAY-31-1997
<CASH>                                          88,798
<SECURITIES>                                     2,877
<RECEIVABLES>                                   84,130
<ALLOWANCES>                                     3,125
<INVENTORY>                                          0
<CURRENT-ASSETS>                               202,891
<PP&E>                                         777,937
<DEPRECIATION>                                 372,530
<TOTAL-ASSETS>                                 795,601
<CURRENT-LIABILITIES>                           65,189
<BONDS>                                        379,565
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        12,778
<OTHER-SE>                                     328,189
<TOTAL-LIABILITY-AND-EQUITY>                   795,601
<SALES>                                              0
<TOTAL-REVENUES>                               216,193
<CGS>                                                0
<TOTAL-COSTS>                                  138,096
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              22,037
<INCOME-PRETAX>                                 14,002
<INCOME-TAX>                                     5,290
<INCOME-CONTINUING>                              8,712
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     8,712
<EPS-PRIMARY>                                      .12
<EPS-DILUTED>                                      .12