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Hutchinson, John (1884-1972), Dalziel, John McEwen (1872-1948), Keay, Ronald William John (1920-1998) , 1954. The ferns and fern-allies of west tropical Africa : flora of west tropical Africa : the British west African territories, Liberia, the French and Portuguese territories south of latitude l8° N. to Lake Chad, and Fernando Po. Crown Agents for Oversea Governments and Administrations, London. 89 pp.