1Thomas Jefferson’s Notes on the Latitude of Willis’s Mountain, [ca. 19 December 1811] (Jefferson Papers)
Willis’s Mountain; TJ takes latitude of [index entry]
2Thomas Jefferson to Bishop James Madison, 29 December 1811 (Jefferson Papers)
Willis’s Mountain; TJ takes latitude of [index entry]
3Thomas Jefferson’s Calculations of Latitude of Willis’s Mountain, 8-9 December 1816 (Jefferson Papers)
Willis’s Mountain; TJ takes latitude of [index entry]
4Thomas Jefferson to John Wayles Eppes, 6 March 1817 (Jefferson Papers)
Willis’s Mountain; TJ takes latitude of [index entry]