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Johnson, Arthur Monrad: A Revision of the North American Species of the Section Boraphila Engler of the Genus Saxifraga (Tourn) L.. 1923. (Reserach Publications of the University of Minnesota, Studies in the Biological Sciences, Number 4, pages 1-110). 19 pls. 110 p. gr8vo. Paper bd.(90395) 31.03
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