1Thomas Jefferson’s Astronomical Calculations, 5-11 February 1811 (Jefferson Papers)
latitude; calculations for Poplar Forest [index entry]
2Théodore Pahlen’s Account of a Visit to Monticello, [between 15 April and 15 May 1811] (Jefferson Papers)
latitude; calculations for Poplar Forest [index entry]
3Thomas Jefferson’s Calculations of Latitude of Poplar Forest, 6 August–10 December 1815 (Jefferson Papers)
latitude; calculations for Poplar Forest [index entry]
4Thomas Jefferson’s Calculations of Latitude of Poplar Forest, 8 November–3 December 1816 (Jefferson Papers)
latitude; calculations for Poplar Forest [index entry]