00542nam a2200181Ia 4500008004100000082001700041100002100058245004200079260003800121300000800159650004100167650003400208653002200242653002300264700002300287700002600310700002400336170901s1957    xx            000 0 und d  a631.45bS24E  aSchwab, Glenn O. 0aElementary Soil and Water Engineering  aLondonbJohn Wiley and Sonsc1957  a296  aAgriculture and related technologies  aTechnology (Applied sciences)  aSoil conservation  aWater conservation  aBarnes, Kenneth K.  aEdminster, Talcott W.  aFrevert, Richard K.