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Carsky, R. ,  Eteka, A. ,  Keatinge, J.D.H. ,  Manyong, Victor M. ,  [Cover crops for natural resource management in West Africa=Plantes de couverture et gestion des ressources naturelles en Afrique occidentale: proceedings of a workshop organized by IITA and CIEPCA, Cotonou, Benin, 2629 October 1999] ,  Cover crops for natural resource management in West Africa=Plantes de couverture et gestion des ressources naturelles en Afrique occidentale: proceedings of a workshop organized by IITA and CIEPCA, Cotonou, Benin, 2629 October 1999