Mailing envelope penned in the hand of Alexander von Humboldt, 5.75 x 4.5, addressed by Humboldt in French and German to "Monsieur Thomas Chase, Tutor de Harvard College, a 141 Friedrichs Strasse, bei Fran Doctor Friedel," and signed in the lower left, "A. V. Humboldt." In fine condition. From the collection of Stephen Adamson.
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