1Thomas Jefferson’s Astronomical Calculations, 5-11 February 1811 (Jefferson Papers)
geography; and TJ’s calculations of latitude [index entry]
2Théodore Pahlen’s Account of a Visit to Monticello, [between 15 April and 15 May 1811] (Jefferson Papers)
geography; and TJ’s calculations of latitude [index entry]
3Thomas Jefferson to John Payne Todd, 10 October 1811 (Jefferson Papers)
geography; and TJ’s calculations of latitude [index entry]
4Thomas Jefferson to Henry A. S. Dearborn, 15 November 1811 (Jefferson Papers)
geography; and TJ’s calculations of latitude [index entry]
5Thomas Jefferson’s Notes on the Latitude of Willis’s Mountain, [ca. 19 December 1811] (Jefferson Papers)
geography; and TJ’s calculations of latitude [index entry]
6William Lambert to Thomas Jefferson, 8 January 1812 (Jefferson Papers)
geography.; and TJ’s calculations of latitude [index entry]
7Thomas Jefferson’s Calculations of Latitude of Poplar Forest, 6 August–10 December 1815 (Jefferson Papers)
geography; and TJ’s calculations of latitude [index entry]
8Thomas Jefferson’s Calculations of Latitude of Poplar Forest, 8 November–3 December 1816 (Jefferson Papers)
geography; and TJ’s calculations of latitude [index entry]
9Thomas Jefferson’s Calculations of Latitude of Willis’s Mountain, 8-9 December 1816 (Jefferson Papers)
geography; and TJ’s calculations of latitude [index entry]