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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 French, signed “Humboldt,” one page, 4.5 x 4.75, no date. Conclusion of a longer untranslated letter. A central vertical fold, scattered light foxing, and mounting remnants to reverse, otherwise fine condition. RRAuction COA.
