<ARTICLE> 5
<CIK> 0000844614
<NAME> 90A
<MULTIPLIER> 1
       
                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-END>                               SEP-30-1998
<CASH>                                         100,575
<SECURITIES>                                         0
<RECEIVABLES>                                   62,626
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                               163,201
<PP&E>                                       5,075,084
<DEPRECIATION>                               3,745,668
<TOTAL-ASSETS>                               1,492,617
<CURRENT-LIABILITIES>                           32,673
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                             0
<OTHER-SE>                                   1,459,944
<TOTAL-LIABILITY-AND-EQUITY>                 1,492,617
<SALES>                                        349,284
<TOTAL-REVENUES>                               353,960
<CGS>                                                0
<TOTAL-COSTS>                                  340,872
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                 13,088
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                             13,088
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    13,088
<EPS-PRIMARY>                                     1.90
<EPS-DILUTED>                                        0