1Nicholas Biddle to Thomas Jefferson, 28 September 1813 (Jefferson Papers)
Biddle, Nicholas; and history of Lewis and Clark Expedition [index entry]
2Paul Allen to Thomas Jefferson, 18 August 1813 (Jefferson Papers)
Biddle, Nicholas; and history of Lewis and Clark Expedition [index entry]
3C. & A. Conrad & Company to Thomas Jefferson, [received 15 April 1810] (Jefferson Papers)
Biddle, Nicholas; and history of Lewis and Clark Expedition [index entry]