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

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