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Bationo, B. André ,  Mokwunye, U ,  Vlek, Paul L.G. ,  Koala, Saidou ,  Shapiro, Barry I. ,  [Soil fertility management for sustainable land use in the West African Sudano-Sahelian zone] ,  Soil fertility management for sustainable land use in the West African Sudano-Sahelian zone

Waswa, Boaz S. ,  Vlek, Paul L.G. ,  Tamene, Lulseged ,  Okoth, Peter F. ,  Mbakaya, DS ,  Zingore, Shamie ,  [Evaluating indicators of land degradation in smallholder farming systems of western Kenya] ,  Evaluating indicators of land degradation in smallholder farming systems of western Kenya