00451nam a2200145Ia 4500008004100000082001600041100001700057245004900074260006200123300000800185650004100193650003400234653002000268653001700288170901s1973    xx            000 0 und d  a631.4bG72S  aGough, H. C. 0aSoil Physical Conditions and Crop Production  aLondonbMinistry of Agriculture, Fisheries and Foodc1973  a505  aAgriculture and related technologies  aTechnology (Applied sciences)  aCrop production  aSoil physics