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Wortmann, Charles S. ,  Ransom, JK ,  [Soil fertility research for maize and bean production systems of the Eastern Africa highlands : Proceedings of a workshop group meeting, Thika, Kenya, 1-4 September, 1992] ,  Soil fertility research for maize and bean production systems of the Eastern Africa highlands : Proceedings of a workshop group meeting, Thika, Kenya, 1-4 September, 1992

Burlingame, B. ,  Dernini, S. ,  Food and Agriculture Organization of the United Nations ,  Bioversity International ,  [Sustainable diets and biodiversity: Directions and solutions for policy, research and action] ,  Sustainable diets and biodiversity: Directions and solutions for policy, research and action