March 18, 1792 | Report Thomas Jefferson to George Washington, March 18, 1792 A detailed examination of the current and future prospect for western expansion and the legal and political ramifications of such movement.
April 18, 1802 | Letter Thomas Jefferson to Robert Livingston, April 18, 1802 Thomas Jefferson sends a cipher to Robert Livingston, as well as his musings on the cession of Louisiana.
September 21, 1803 | Letter Thomas Jefferson to William Dunbar, September 21, 1803 Thomas Jefferson questions William Dunbar about Spanish borders in the Louisiana Territory.