00813nam0-22003011i-450-99000385828040332120080115132720.0000385828FED01000385828(Aleph)000385828FED0100038582820030910d--------km-y0itay50------baitaITFarming Systems in the TropicsHans Ruthenberg.OxfordClarendon Press1971.xiv, 313 p.ill.24 cmAgricolturaAfricaF/1.121H/1.110Ruthenberg,Hans118444ITUNINARICAUNIMARCBK990003858280403321F/1.121 RUT/15515/ISESSESFarming Systems in the Tropics515024UNINA