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Ellis-Jones, J. ,  Schulz, S. ,  Chikoye, D. ,  Haan, N. de ,  Kormawa, P.M. ,  Adedzwa, D. ,  [Participatory research and extension approaches: IITA research guide, No. 71] ,  Participatory research and extension approaches: IITA research guide, No. 71

Ajaero, J.O ,  Asiabaka, C.C. ,  Haan, N. de ,  [Indigenous seed production and distribution strategies in northern Guinea savannah Nigeria: opportunities for herbaceous legumes] ,  Indigenous seed production and distribution strategies in northern Guinea savannah Nigeria: opportunities for herbaceous legumes