1Thomas Jefferson to José Corrêa da Serra, 20 July 1816 (Jefferson Papers)
War Department, U.S.; and papers of Lewis and Clark Expedition [index entry]
2Thomas Jefferson to William Clark, 8 September 1816 (Jefferson Papers)
War Department, U.S.; and papers of Lewis and Clark Expedition [index entry]
3Thomas Jefferson to John Vaughan, 28 June 1817 (Jefferson Papers)
War Department, U.S.; and papers of Lewis and Clark Expedition [index entry]
4Thomas Jefferson to Peter S. Du Ponceau, 7 November 1817 (Jefferson Papers)
War Department, U.S.; and papers of Lewis and Clark Expedition [index entry]
5Thomas Jefferson to Peter S. Du Ponceau, 30 December 1817 (Jefferson Papers)
War Department, U.S.; and papers of Lewis and Clark Expedition [index entry]