00406nam a2200145Ia 4500008004100000020001500041082001400056100002100070245003600091260003400127300000800161650004100169650003400210653001600244170901s1975    xx            000 0 und d  a0126565503  a630bS63B  aSpedding, C.R.W. 0aBiology of Agricultural Systems  aLondonbAcademic Presswc1975  a261  aAgriculture and related technologies  aTechnology (Applied sciences)  aAgriculture