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,” three pages on two adjoining sheets, 4 x 4.75, no date. Untranslated handwritten letter to "Monsieur Poisson" in Montmartre. In very good to fine condition, with light wrinkling, rusty paperclip impressions to the last page, and partial seal-related loss to one corner.
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