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. Humboldt,” one page both sides, 3.75 x 4.75, no date. A fascinating scientific letter to the geologist Brochant de Villiers, speaking about several types of minerals. In very good to fine condition, with scattered light foxing, and a stain to the upper right corner.
This item is Pre-Certified by PSA/DNA
Buy a third-party letter of authenticity for
$35.00
*This item has been pre-certified by a trusted third-party authentication service, and by placing a bid on this item, you agree to accept the opinion of this authentication service. If you wish to have an opinion rendered by a different authenticator of your choosing, you must do so prior to your placing of any bid. RR Auction is not responsible for differing opinions submitted 30 days after the date of the sale.
