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Soil erosion control and agroforestry in the West Usambara Mountains : evalutaion of an extension approach
Woytek, Reinhard (ed.) - 1987
Persistent link: https://www.econbiz.de/10000741777
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L' analyse socio-economique des systèmes d'exploitation agricole et de la gestion de terroir dans le Bas-Saloum, Sénégal
Busacker, Dietrich (contributor) - 1990
Persistent link: https://www.econbiz.de/10013382644