00511nam a2200169Ia 4500008004100000082001700041100001900058245008500077250000600162260003300168300000800201650004100209650003400250653001700284700001900301700002100320170901s1961    xx            000 0 und d  a631.43bK93S  aKononova, M.M. 0aSoil Organic Matter its Nature, its role in soil formation and in soil fertility  a1  aOxfordbPergamon Pressc1961  a544  aAgriculture and related technologies  aTechnology (Applied sciences)  aSoil physics  aNewman, A.C.D.  aNowakowski, T.Z.