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| 041 | _aEN | ||
| 082 |
_a630 _bSYM _223 |
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| 100 | _aSYMPOSIUM on the sustainability of agricultural production s | ||
| 245 | _a Proceedings of the symposium on the Sustainability of Agricultural Production Systems in Sub - Saharan Africa / | ||
| 260 |
_aNorway _bNORAGRIC _c1990 |
||
| 300 | _a320 p. | ||
| 440 | _aNORAGRIC Occasional papers series c | ||
| 500 | _asponsored by Norwegian centre for International Agricultural Development at the Agricultural University of Norway funding provided by NAVF,Aas, 4-7 september 1989. | ||
| 942 | _cS | ||