Letters to H.A. Hagen, 1881-1884.
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Hagen, Hermann August, 1817-1893
http://n2t.net/ark:/99166/w6hm60ng (person)
Epithet: of the Museum of Natural History, Cambridge, Mass British Library Archives and Manuscripts Catalogue : Person : Description : ark:/81055/vdc_100000001190.0x00004e ...
Kunow, Gustav 1847-1911
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