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VEGETATION DER ERDE: Band 13: Harshberger, J.: Phytogeographic Survey of North America. With a short survey of contents in German by O.Drude. Leipzig 1911. (Reprint 1958). 32 figs. 1 map. 18 pls. XII,790 p. (10221) 52.00 (ISBN 978-3-7682-0003-5)
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