00277nam a2200097Ia 4500008004100000082002000041100003300061245003100094260004600125300000800171140113s9999    xx            000 0 und d  a631.4(213)   L2  aNational Academy of Sciences  aSoils of the Humid Tropics  a1972bNational Academy of SciencecU.S.A.  a219