1Bernard McMahon to Thomas Jefferson, 24 December 1809 (Jefferson Papers)
Lewis and Clark Expedition; plants from [index entry]
2Benjamin Smith Barton to Thomas Jefferson, 16 October 1810 (Jefferson Papers)
Lewis and Clark Expedition; plants from [index entry]
3William Clark to Thomas Jefferson, 10 October 1816 (Jefferson Papers)
Lewis and Clark Expedition; plants from [index entry]