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Amazon.com: Letters of Alexander von Humboldt: Written between the Years 1827 and 1858, to Varnhagen von Ense; Together with Extracts from Varnhagen's Diaries, ... Library Collection - Earth Science): 9781108004619: von Humboldt, Alexander: Books
Alexander von Humboldt - Wikipedia
Alexander von Humboldt and the United States: Art, Nature, and Culture: Harvey, Eleanor Jones, Sues, Hans-Dieter: 9780691200804: Amazon.com: Books
