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. v. Humboldt,” one page, 5.5 x 9, March 23, 1847. Untranslated handwritten letter to pioneering American astronomer Benjamin Apthorp Gould (1824-1896), who is noted for creating the Astronomical Journal, discovering the Gould Belt, and for founding the Argentine National Observatory and the Argentine National Weather Service. In fine condition, with a small stain, and light show-through in the top blank area from old mounting residue on the back. Accompanied by the original mailing envelope addressed in Humboldt's own hand.
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