<ARTICLE> 5
<CIK> 0000727538
<NAME> ART.5 FDS FOR 10-K
<MULTIPLIER> 1,000
<CURRENCY> U.S.DOLLAR
       
                             
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-START>                             JAN-01-1996
<PERIOD-END>                               DEC-31-1996
<EXCHANGE-RATE>                                  1,000
<CASH>                                       1,737,470
<SECURITIES>                                         0
<RECEIVABLES>                                3,046,185
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                             4,783,655
<PP&E>                                     162,877,903
<DEPRECIATION>                           (155,409,894)
<TOTAL-ASSETS>                              12,251,664
<CURRENT-LIABILITIES>                        1,755,930
<BONDS>                                      1,997,500
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                             0
<OTHER-SE>                                   8,498,234
<TOTAL-LIABILITY-AND-EQUITY>                12,251,664
<SALES>                                     17,510,612
<TOTAL-REVENUES>                            17,535,311
<CGS>                                        5,537,026
<TOTAL-COSTS>                                5,537,026
<OTHER-EXPENSES>                               871,370
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                             339,045
<INCOME-PRETAX>                             11,126,915
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                         11,126,915
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<CHANGES>                                            0
<NET-INCOME>                                11,126,915
<EPS-PRIMARY>                                    7,032
<EPS-DILUTED>                                    7,032