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  1. Letters of Alexander von Humboldt to Varnhagen von Ense. From 1827 to 1858. With extracts from Varnhagen's diaries, and letters of Varnhagen and others to Humboldt. Tr. from the 2d German ed. by Friedrich Kapp.
    By: Humboldt, Alexander von, - Assing, Ludmilla, - Kapp, Friedrich, - Varnhagen von Ense, Karl August,
    Publication info: New York,Rudd & Carleton; [etc., etc.]1860.
    Contributed by: University of Pittsburgh Library System (archive.org)
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