February 12, 1799 | Letter Daniel Clark to Thomas Jefferson, February 12, 1799 Daniel Clark, of New Orleans, writes to Thomas Jefferson on behalf of Philip Nolan, promising a summary of Nolan's information and impressions about New Mexico and the Louisiana Territory. Clark also uses the letter to introduce Jefferson to the work of William Dunbar.
November 12, 1799 | Letter Daniel Clark to Thomas Jefferson, November 12, 1799 Daniel Clark writes of Philip Nolan's close brush with death in New Mexico and informs Jefferson of Nolan's plan to travel to the United States. Clarks takes the liberty of sending along a box of pecans for Jefferson.
August 22, 1801 | Letter William Dunbar to Thomas Jefferson, August 22, 1801 William Dunbar writes to Thomas Jefferson of scientific matters, including the properties of rainbows. Dunbar anticipates fossil finds west of the Mississippi River, based on information forwarded by the late Philip Nolan. This letter, with several other missives and reports written by Dunbar, were forward by Jefferson to the American Philosphical Society, where they were read before the Society and later published in theTransactions of the Philosophical Society of Americain 1809. See the "Reports" section of this archive.
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.
May 13, 1804 | Letter William Dunbar to Thomas Jefferson, May 13, 1804 William Dunbar thanks Thomas Jefferson for his comments about Dunbar's notes on the Mississippi River. Spain's land sales in Western Florida draw the author's attention and Dunbar offers approval of continuing explorations on America's western rivers, while bemoaning Congress' reluctance to adequately fund such expeditions.