Proceedings of the symposium on the sustainability of agricultural production systems in sub-saharan Africa, 4-7 September, 1989, AAS, Norway / NORAGRIC.
Material type:
BookSeries: NORAGRIC. Occasional papers. Series C, Development and environment ; NORAGRIC. Occasional papers. Series C, Development and environmentNORAGRIC. Occasional papers. Series C, Development and environmentNORAGRIC. Occasional papers. Series C, Development and environment: no. 4Publisher: AAS-NLH : Norwegian Centre for Informational Agricultural Development, AAS-NLH : Norwegian Centre for Informational Agricultural Development, 1990
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