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Hydrology and water management in the humid tropics : hydrological research issues and strategies for water management / Unesco ; ed. by Michael Bonell, Maynard M. Hufschmidt, John S. Gladwell.
- UNESCO [etc.],
- 1993.
- Paris [etc.] :
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Land use policies in West Africa / John O. Igue and Bio G. Soule.
- Club du Sahel [etc.],
- 1993.
- Paris [etc.] :