00435nam a2200145Ia 4500008004100000082001700041100001600058245007300074260002700147300000800174650004100182650003400223653002000257653001200277170901s1974    xx            000 0 und d  a631.51bK55A  aKhan, A. R. 0aArt and Science of TillagebA critical study of some of its problems  aKhurjabA R Khanc1974  a113  aAgriculture and related technologies  aTechnology (Applied sciences)  aCrop production  aTillage