000			00433nam a2200121Ia 4500
008			130225s9999 xx 000 0 und d
080			_a631.67.008.2(063) _bN277P
245			_aProceedings of national conference : Irrigation return flow quality management
260			_aFort Collins, Colorado _bOffice of University Communications, Colorado State Universi _c1978
300			_aviii, 451 p. : ill
901			_a153105
942			_cB _2udc
999			_c11502 _d11502