January 25, 1786 | Letter Thomas Jefferson to Archibald Stuart, January 25, 1786 Thomas Jefferson thanks Archibald Stuart for his correspondence and worries over the United States' financial help and credit abroad. Jefferson writes that Kentucky's possible cession would be disastrous to his hopes that the new nation serve as the core of settlement for both North and South America.
February 7, 1786 | Letter John Ledyard to Thomas Jefferson, February 7, 1786 John Ledyard warns Thomas Jefferson that Native accounts of fossil origins may not be reliable.
May 13, 1803 | Letter Bernard Lacépède to Thomas Jefferson, May 13, 1803 Bernard Lacépède applauds Jefferson's dedication to exploration and expansion, predicting success and the expansion of United States trade and communication because of it.