1Thomas Cooper to Thomas Jefferson, 22 September 1814 (Jefferson Papers)
botany; study of [index entry]
2George Ticknor to Thomas Jefferson, 14 October 1815 (Jefferson Papers)
botany; study of [index entry]
3José Corrêa da Serra to Thomas Jefferson, 16 June 1816 (Jefferson Papers)
botany; study of [index entry]
4Robert B. Stark to Thomas Jefferson, 20 August 1818 (Jefferson Papers)
botany; study of [index entry]
5Arsenne Thiébaut de Berneaud to Thomas Jefferson, 17 December 1821 (Jefferson Papers)
botany; study of [index entry]