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Mahapatra, I.C. ,  Pérez, A.T. ,  Buddenhagen, I.W. ,  [Progress and problems in attempting changes in rice varieties and rice technology at the farm level in two countries of West Africa: paper presented at the WARDA Varietal Improvement Seminar, Bouake, Ivory Coast, September 1317, 1976] ,  Progress and problems in attempting changes in rice varieties and rice technology at the farm level in two countries of West Africa: paper presented at the WARDA Varietal Improvement Seminar, Bouake, Ivory Coast, September 1317, 1976