1Thomas Jefferson to Alexander von Humboldt, 6 March 1809 (Jefferson Papers)
botany; scholars of [index entry]
2Thomas Jefferson to André Thoüin, 11 May 1815 (Jefferson Papers)
botany; scholars of [index entry]
3Thomas Jefferson to Robert Greenway, 17 April 1821 (Jefferson Papers)
botany; scholars of [index entry]