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By Metcalfe, C. R..
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By Metcalfe, C. R..
Oxford Clarendon Press 1957 .
2 v. (lxiv, 1500 p.) , Reprinted from corrected sheets of the first edition, 1950. 25 cm..

By Gundersen, Alfred.
Waltham, Mass. Chronica Botanica Co. 1950 .
xvii, 237 p. 23 cm..

By Goldberg, Aaron..
Washington, DC Dept. of Systematic Biology--Botany, National Museum of Natural History 2003 .
185 p. 26 cm..