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Salinas, JG ,  Gourley, LM ,  [Workshop on Evaluating Sorghum for Tolerance to Al-toxic Tropical Soils in Latin America (1984, Cali, Colombia). Sorghum for acid soils: Proceedings] ,  Workshop on Evaluating Sorghum for Tolerance to Al-toxic Tropical Soils in Latin America (1984, Cali, Colombia). Sorghum for acid soils: Proceedings

Wortmann, Charles S. ,  [Bean improvement for low fertility soils in Africa : Proceedings of a working group meeting, Kampala, uganda 23-26 May, 1994] ,  Bean improvement for low fertility soils in Africa : Proceedings of a working group meeting, Kampala, uganda 23-26 May, 1994