RC (MHi); endorsed by TJ as received 5 Oct. 1818 and so recorded in SJL. RC (DLC); address cover only; with PoC of TJ to William Radford and Joel Yancey, 31 Dec. 1818, on recto and verso; addressed: “Thomas Jefferson Esqr Monticello Virginia”; franked; postmarked Albany, 21 Sept., and Monticello [N.Y.?], 28 Sept. Enclosure: Clinton, A Memoir on the Antiquities of the Western Parts of the State of New-York. Read before the Literary and Philosophical Society of New-York (Albany, 1818; Poor, Jefferson’s Library description begins Nathaniel P. Poor, Catalogue. President Jefferson’s Library, 1829 description ends , 5 [no. 173]; TJ’s copy in MiU-C); dated Albany, 7 Oct. 1817, and addressed from Clinton as society president to its vice president, Samuel L. Mitchill; asserting that “the western parts of the United States were, prior to their discovery and occupation by Europeans, inhabited by numerous nations in a settled state and much further advanced in civilization than the present tribes of Indians” (p. 4); and, as evidence, describing the towns, artifacts, and human remains he had observed in the western counties of New York.