1Thomas Jefferson to Paul Allen, 18 August 1813 (Jefferson Papers)
Clark (Clarke), William; and Lewis and Clark Expedition [index entry]
2José Corrêa da Serra to Thomas Jefferson, 29 March 1816 (Jefferson Papers)
Clark (Clarke), William; and Lewis and Clark Expedition [index entry]
3Thomas Jefferson to Henry Dearborn, 27 October 1818 (Jefferson Papers)
Clark (Clarke), William; and Lewis and Clark Expedition [index entry]