00509nam a2200169Ia 4500008004100000082001600041100004400057245004400101250000600145260005000151300000800201650004100209650003400250653001500284653001800299700002200317170901s1969    xx            000 0 und d  a631.71bU4W  aUnited States Department of Agriculture 0aWaterbThe Yearbook of Agriculture-1955  a1  aCalcuttabOxford and IBH Publishing Co.c1969  a751  aAgriculture and related technologies  aTechnology (Applied sciences)  aIrrigation  aWater quality  aBenson, Ezra Taft