00529nam a2200181Ia 4500008004100000082001700041100002000058245004200078250000600120260004600126300000800172650004100180650003400221653002200255653002300277700002300300700002400323170901s1957    xx            000 0 und d  a631.45bS24E  aSchwab, Glenn.O 0aElementary Soil and Water Engineering  a2  aNew YarkbJohn Wiley and Sons, Inc.c1957  a316  aAgriculture and related technologies  aTechnology (Applied sciences)  aSoil conservation  aWater conservation  aBarnes, Kenneth. K  aFrevert, Richard. K