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1Managing soil fertility in the tropics: a resource guide for participatory learning and action research. v.1. Textbook v.2. Case studies. v.3. Field tools. v.4. CD-Rom. v.5. Manua... Managing soil fertility in the tropics: a resource guide for participatory learning and action research. v.1. Textbook v.2. Case studies. v.3. Field tools. v.4. CD-Rom. v.5. Manua...bibliotecaIICA
