German naturalist and explorer (1769–1859) who wrote Kosmos, a massive five-volume study which attempted to unify the various branches of man’s knowledge. ALS in German, signed “A. Humboldt,” one page, 4.75 x 3, January 15, 1837. An untranslated six-line letter. Matted and framed with a color portrait to an overall size of 22.25 x 19.5. A few small edge tears, light wrinkling, and mild soiling, otherwise fine condition. R&R COA.
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