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Okigbo, B. ,  [Fitting research to farming systems: based on observations and preliminary studies of traditional agriculture in Eastern Nigeria: paper presented at the Second International Seminar on Change in Agriculture, Reading, 919 Sept., 1974] ,  Fitting research to farming systems: based on observations and preliminary studies of traditional agriculture in Eastern Nigeria: paper presented at the Second International Seminar on Change in Agriculture, Reading, 919 Sept., 1974

Lagemann, J. ,  Flinn, J.C. ,  Okigbo, B. ,  Moorman, F.R. ,  [Root crop/oil palm farming systems: a case study from Eastern Nigeria] ,  Root crop/oil palm farming systems: a case study from Eastern Nigeria