00453nam a2200145Ia 4500008004100000020001500041082001700056100001900073245005600092260005700148300000800205650004100213650003400254653001900288170901s1973    xx            000 0 und d  a0444410171  a631.41bA41S  aAllison, F. E. 0aSoil Organic Matter and Its Role in Crop Production  aLondonbElsevier Scientific Publishing Companyc1973  a637  aAgriculture and related technologies  aTechnology (Applied sciences)  aSoil chemistry