1William Clark to Thomas Jefferson, 10 October 1816 (Jefferson Papers)
Lewis and Clark Expedition; and Indian vocabularies [index entry]
2Thomas Jefferson to William Clark, 8 September 1816 (Jefferson Papers)
Lewis and Clark Expedition; and Indian vocabularies [index entry]
3Thomas Jefferson to José Corrêa da Serra, 26 April 1816 (Jefferson Papers)
Lewis and Clark Expedition; and Indian vocabularies [index entry]