00483nam a2200169Ia 4500008004100000082001700041100002100058245004500079250000600124260004600130300000800176650004100184650003400225653001500259653001800274700002100292170901s1970    xx            000 0 und d  a631.71bW56A  aWillrich, Ted. L 0aAgricultural Practices and Water Quality  a1  aUSbThe loes state university Pressc1970  a415  aAgriculture and related technologies  aTechnology (Applied sciences)  aIrrigation  aWater quality  aSmith, George. E