Cambridge, At the University Press 1953. Stor 8vo. 484 s. Illustr. Originalbind med vareomslag. Omslaget er litt rufsut, særleg langs kantane. (Sheridan Professor Emeritus of Botany, Oxford Lately Chairman of the Nature Conservancy (Privy Council). Honorary Fellow of Trinity College, Cambridge. With 162 Plates containing 418 photographs and 179 Figures in the text. Volume I ( A Complete set has two volumes) 1953.
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