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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.
    By: Humboldt, Alexander von, - Assing, Ludmilla, - Kapp, Friedrich, - Varnhagen von Ense, Karl August,
    Publication info: New York,Rudd & Carleton; [etc., etc.]1860.
    Holding Institution: University of Pittsburgh Library System (archive.org)
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