<ARTICLE> 5 <PERIOD-TYPE> 6-MOS <FISCAL-YEAR-END> DEC-31-1997 <PERIOD-END> JUN-30-1997 <CASH> 230,644 <SECURITIES> 0 <RECEIVABLES> 157,209 <ALLOWANCES> 73,863 <INVENTORY> 0 <CURRENT-ASSETS> 0 <PP&E> 2,660,165 <DEPRECIATION> 2,468,129 <TOTAL-ASSETS> 507,001 <CURRENT-LIABILITIES> 0 <BONDS> 0 <COMMON> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <OTHER-SE> 493,002 <TOTAL-LIABILITY-AND-EQUITY> 507,001 <SALES> 0 <TOTAL-REVENUES> 225,416 <CGS> 0 <TOTAL-COSTS> 187,443 <OTHER-EXPENSES> 0 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 0 <INCOME-PRETAX> 37,973 <INCOME-TAX> 0 <INCOME-CONTINUING> 37,973 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 37,973 <EPS-PRIMARY> 0 <EPS-DILUTED> 0