<TABLE> <S> <C>


<ARTICLE>                     5

<S>                                 <C>                 <C>                 <C>
<PERIOD-TYPE>                       3-MOS               3-MOS               3-MOS
<FISCAL-YEAR-END>                   DEC-31-1997         DEC-31-1997         DEC-31-1997
<PERIOD-START>                      JAN-01-1997         APR-01-1997         JUL-01-1997
<PERIOD-END>                        MAR-31-1997         JUN-30-1997         SEP-30-1997
<CASH>                                  890,397             222,675             241,069
<SECURITIES>                                  0                   0                   0
<RECEIVABLES>                         6,943,759           7,323,414           8,852,783
<ALLOWANCES>                            520,000             520,000             520,000
<INVENTORY>                                   0                   0                   0
<CURRENT-ASSETS>                     10,987,705          10,878,736          12,919,335
<PP&E>                              227,939,358         235,010,843         242,378,197
<DEPRECIATION>                      107,488,846         116,527,998         125,794,785
<TOTAL-ASSETS>                      173,965,335         170,155,107         168,512,639
<CURRENT-LIABILITIES>                38,376,382          38,981,226          39,025,542
<BONDS>                              84,169,127          78,215,430          75,511,733
<PREFERRED-MANDATORY>                         0                   0                   0
<PREFERRED>                                   0                   0                   0
<COMMON>                                 11,074              11,103              11,137
<OTHER-SE>                           28,987,769          29,718,063          30,607,775
<TOTAL-LIABILITY-AND-EQUITY>        173,965,335         170,155,107         168,512,639
<SALES>                              29,466,873          31,391,287          32,216,238
<TOTAL-REVENUES>                     29,466,873          31,391,287          32,216,238
<CGS>                                         0                   0                   0
<TOTAL-COSTS>                        26,537,639          28,341,710          29,102,161
<OTHER-EXPENSES>                              0                   0                   0
<LOSS-PROVISION>                              0                   0                   0
<INTEREST-EXPENSE>                    2,394,864           2,324,826           2,229,420
<INCOME-PRETAX>                         566,619             757,061             891,300
<INCOME-TAX>                            205,000             271,500             319,500
<INCOME-CONTINUING>                     361,619             485,561             571,800
<DISCONTINUED>                                0                   0                   0
<EXTRAORDINARY>                               0                   0                   0
<CHANGES>                                     0                   0                   0
<NET-INCOME>                            361,619             485,561             571,800
<EPS-PRIMARY>                              0.03                0.04                0.05
<EPS-DILUTED>                              0.03                0.04                0.05



</TABLE>