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
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Richard Tonsing and the Online Distributed Proofreading Team at https://www.pgdp.net (This file was produced from images generously made available by The Internet Archive)
Project Gutenberg
United States: Rudd & Carleton, 1860.