SYMPOSIUM on the sustainability of agricultural production s
Proceedings of the symposium on the Sustainability of Agricultural Production Systems in Sub - Saharan Africa / - Norway NORAGRIC 1990 - 320 p. - NORAGRIC Occasional papers series c .
sponsored by Norwegian centre for International Agricultural Development at the Agricultural University of Norway funding provided by NAVF,Aas, 4-7 september 1989.
630 / SYM
Proceedings of the symposium on the Sustainability of Agricultural Production Systems in Sub - Saharan Africa / - Norway NORAGRIC 1990 - 320 p. - NORAGRIC Occasional papers series c .
sponsored by Norwegian centre for International Agricultural Development at the Agricultural University of Norway funding provided by NAVF,Aas, 4-7 september 1989.
630 / SYM