00481nam a2200157Ia 4500008004100000020001500041082002000056245004900076260007200125300000800197650004100205650003400246653001100280653002000291653001200311170901s1993    xx            000 0 und d  a9251034427  a631.51096bF60S 0aSoil tillage in Africabneeds and challenges  aRomebFood and Agriculture Organization of the United Nationsc1993  a190  aAgriculture and related technologies  aTechnology (Applied sciences)  aAfrica  aCrop production  aTillage