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Flora of West Tropical Africa. The British West African Territories, Liberia, the French and Portuguese Territories South of latitude 18° N. to Lake Chad, and Fernado Po. Second edition revised by R. W. J. Keay. Vol. I. (London: Crown Agents for Oversea Governments and Administrations, 1954-1958). [M.C.: Afrique noire, Afrique de l'Ouest, botanique, flore]