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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 California Libraries (archive.org)
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  2. Letters of Alexander von Humboldt written between the years 1827 and 1858 to Varnhagen von Ense together with extracts from Varnhagen's diaries, and letters of Varnhagen and others to Humboldt / authorized translation from the German ; with explanatory notes and a full index of names.
    By: Humboldt, Alexander von, - Assing, Ludmilla, - Kapp, Friedrich, - Varnhagen von Ense, Karl August,
    Edition: [3rd ed.]
    Publication info: London :Trübner,1860.
    Contributed by: University of California Libraries (archive.org)
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