000			00317nam a2200133Ia 4500
008			160710s1992 xx 000 0 und d
020			_a873716795
082			_a541.49'01'13 WAL
100			_aWALTON,WC
245			_aGROUND WATER MODELING UTILITIES
260			_bLEWIS PUB. _c1992
300			_a640
942			_2ddc _cB
999			_c61268 _d61268