1Thomas Jefferson to Caspar Wistar, 31 March 1809 (Jefferson Papers)
Lewis, Meriwether; prepares for Lewis and Clark Expedition [index entry]
2Robert Patterson to Thomas Jefferson, 10 May 1809 (Jefferson Papers)
Lewis, Meriwether; prepares for Lewis and Clark Expedition [index entry]
3Thomas Jefferson to Paul Allen, 18 August 1813 (Jefferson Papers)
Lewis, Meriwether; prepares for Lewis and Clark Expedition [index entry]