00319nam a2200097Ia 4500008004100000082001500041100002300056245009400079260004000173300000800213140113s9999    xx            000 0 und d  a631.4   K1  a"Donahue, Roy. L."  aOur soils and their management an Introduction to soil and water conservation 2nd edition  a1961bAsia Publishing HousecBombay  a568