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<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-END> JUN-30-2000
<CASH> 1,130,086
<SECURITIES> 0
<RECEIVABLES> 4,786,458
<ALLOWANCES> 163,000
<INVENTORY> 0
<CURRENT-ASSETS> 7,941,061
<PP&E> 83,713,814
<DEPRECIATION> (39,979,767)
<TOTAL-ASSETS> 51,682,896
<CURRENT-LIABILITIES> 8,294,249
<BONDS> 600,000
0
0
<COMMON> 91,869
<OTHER-SE> 42,696,778
<TOTAL-LIABILITY-AND-EQUITY> 51,682,896
<SALES> 0
<TOTAL-REVENUES> 8,493,760
<CGS> 0
<TOTAL-COSTS> 7,507,357
<OTHER-EXPENSES> 354,733
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 90,678
<INCOME-PRETAX> 567,862
<INCOME-TAX> 0
<INCOME-CONTINUING> 567,862
<DISCONTINUED> 0
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<CHANGES> 0
<NET-INCOME> 567,862
<EPS-BASIC> 0.06
<EPS-DILUTED> 0.06
</TABLE>
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