<ARTICLE> 5 <PERIOD-TYPE> 9-MOS <FISCAL-YEAR-END> DEC-31-1996 <PERIOD-END> SEP-30-1996 <CASH> 120,210 <SECURITIES> 0 <RECEIVABLES> 69,318 <ALLOWANCES> 7,973 <INVENTORY> 0 <CURRENT-ASSETS> 0 <PP&E> 3,563,112 <DEPRECIATION> 3,139,998 <TOTAL-ASSETS> 646,332 <CURRENT-LIABILITIES> 0 <BONDS> 0 <COMMON> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <OTHER-SE> 617,075 <TOTAL-LIABILITY-AND-EQUITY> 646,332 <SALES> 0 <TOTAL-REVENUES> 304,152 <CGS> 0 <TOTAL-COSTS> 386,827 <OTHER-EXPENSES> 0 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 0 <INCOME-PRETAX> 28,572 <INCOME-TAX> 0 <INCOME-CONTINUING> 28,572 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 28,572 <EPS-PRIMARY> 0 <EPS-DILUTED> 0