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Hutchinson, John (1884-1972), Dalziel, John McEwen (1872-1948), Hepper, Frank Nigel (1929-2013) , 1968. Flora of west tropical Africa : all territories in West Africa south of latitude 18 N. and to the west of Lake Chad, and Fernando Po. Crown Agents for Oversea Governments and Administrations, London. 276 pp.