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Draft report on the agro-socio-economic survey of 2 sites in Central Nigeria : wetland utilization research project West Africa : phase II, pre-implementation stage / Tesfaye Gebremeskel, C. Anthonie de Vries.
- International institute for land reclamation & improvement,
- 1985.
- Wageningen :
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Summary report on a consultancy mission to the trend project in the upper region of Ghana / L.F. Kortenhorst.
- International institute for land reclamation & improvement,
- 1980.
- Wageningen :