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. Untranslated ALS in French, signed “A. v. Humboldt,” one page, 5.25 x 8.5, December 15, 1855. In fine condition, with mild toning. Pre-certified PSA/DNA and RR Auction COA.
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