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TECHNOLOGY OPTIONS FOR SUSTAINABLE AGRICULTURAL PRODUCTION IN SUB-SAHARAN AFRICA
(OUA-CSTR - SAFGRAD, 1997-04)
TOWARDS SUSTAINABLE FARMING SYSTEMS IN SUB-SAHARAN AFRICAVERS DES SYSTEMES DE PRODUCTIONDURABLE ENAERIQUE SUB-SAHARIENNE
(OAU/STRC - SAFGRADAAFSRET Secretarial, 1996-08)