1To James Madison from Vincent Gray, 28 April 1804 (Abstract) (Madison Papers)
28 April 1804, Havana. Had intended to forward by Baron von Humboldt, who is returning from South...
2To Alexander Hamilton from Vincent Gray, [28 April 1804] (Hamilton Papers)
Baron Humboldt Supreme counseller of Mines in the service of His Prussian Majesty and Member of...