00433nam a2200157Ia 4500008004100000020001500041082001800056100002100074245003500095260003400130300000800164650004100172650003400213653001600247653001200263170901s1976    xx            000 0 und d  a0198594615  a630.913bR98F  aRuthenberg, Hans 0aFarming Systems in the Tropics  aOxfordbClarendon Pressc1976  a366  aAgriculture and related technologies  aTechnology (Applied sciences)  aAgriculture  aTropics