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 “Ht.,” one page, 4 x 5, no date. Untranslated handwritten letter by the celebrated naturalist. In fine condition, with Humboldt's surname penned at the top in another hand. Accompanied by an unsigned engraved portrait.
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