WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

  

<ARTICLE> 5
       
                             
<PERIOD-TYPE>                   QTR-3
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               SEP-30-1996
<CASH>                                           6,309
<SECURITIES>                                         0
<RECEIVABLES>                                   14,915
<ALLOWANCES>                                         0
<INVENTORY>                                      8,519
<CURRENT-ASSETS>                                32,183
<PP&E>                                       1,066,457
<DEPRECIATION>                                 709,640
<TOTAL-ASSETS>                                 392,492
<CURRENT-LIABILITIES>                           34,384
<BONDS>                                              0
<COMMON>                                             0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<OTHER-SE>                                           0
<TOTAL-LIABILITY-AND-EQUITY>                   392,492
<SALES>                                        188,904
<TOTAL-REVENUES>                               188,904
<CGS>                                           53,528
<TOTAL-COSTS>                                   54,988
<OTHER-EXPENSES>                                 1,128
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                  57
<INCOME-PRETAX>                                133,013
<INCOME-TAX>                                    91,903
<INCOME-CONTINUING>                             41,110
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    41,110
<EPS-PRIMARY>                                        0
<EPS-DILUTED>                                        0