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A cocoabased cropping system on basaltic soils (typic tropohumult) in southeastern Nigeria por Eshett, E.T., Ay, P., Omueti, J.A.I., Juo, A.S.R.

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Production costs in the yambased cropping systems of southeastern Nigeria: RCMP research monograph, No. 6 por Nweke, F., Ugwu, B., Asadu, C., Ay, P.

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Seasonality of cassava processing in Africa and tests of hypotheses: COSCA working paper, No. 6 por Ugwu, B., Ay, P.

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