1Thomas Jefferson to Isaac Briggs, 17 April 1816 (Jefferson Papers)
Borda’s circle (surveying instrument) [index entry]
2Thomas Jefferson to Bartholomew Fuller, 17 December 1819 (Jefferson Papers)
Borda’s circle (surveying instrument) [index entry]
3Thomas Jefferson to Fernagus De Gelone, 7 March 1817 (Jefferson Papers)
Borda’s circle (surveying instrument) [index entry]
4Fernagus De Gelone to Thomas Jefferson, 15 March 1817 (Jefferson Papers)
Borda’s circle (surveying instrument) [index entry]
5Thomas Jefferson to Bishop James Madison, 29 December 1811 (Jefferson Papers)
Borda’s circle (surveying instrument) [index entry]
6Thomas Jefferson to Wilson Cary Nicholas, 19 April 1816 (Jefferson Papers)
Borda’s circle (surveying instrument) [index entry]
7Thomas Jefferson to Robert Patterson, 13 October 1815 (Jefferson Papers)
Borda’s circle (surveying instrument) [index entry]
8Thomas Jefferson to Robert Patterson, 21 March 1811 (Jefferson Papers)
Borda’s circle (surveying instrument) [index entry]
9Thomas Jefferson’s Calculations of Latitude of Willis’s Mountain, 8-9 December 1816 (Jefferson Papers)
Borda’s circle (surveying instrument) [index entry]
10Thomas Jefferson’s Observations at Monticello Related to Calculation of Latitude, 11 October 1815–31 January 1816 (Jefferson Papers)
Borda’s circle (surveying instrument) [index entry]