1Thomas Jefferson to Bishop James Madison, 29 December 1811 (Jefferson Papers)
surveying; and J. C. Borda’s circle [index entry]
2Thomas Jefferson’s Observations at Monticello Related to Calculation of Latitude, 11 October 1815–31 January 1816 (Jefferson Papers)
surveying; and J. C. Borda’s circle [index entry]
3Thomas Jefferson to Robert Patterson, 13 October 1815 (Jefferson Papers)
surveying; and J. C. Borda’s circle [index entry]
4Enclosure: Ferdinand R. Hassler’s List of Scientific lnstruments Procured for the United States Coast Survey, November … (Jefferson Papers)
surveying; and J. C. Borda’s circle [index entry]
5Thomas Jefferson to Isaac Briggs, 17 April 1816 (Jefferson Papers)
surveying; and J. C. Borda’s circle [index entry]
6Thomas Jefferson to Wilson Cary Nicholas, 19 April 1816 (Jefferson Papers)
surveying; and J. C. Borda’s circle [index entry]
7Thomas Jefferson’s Calculations of Latitude of Willis’s Mountain, 8-9 December 1816 (Jefferson Papers)
surveying; and J. C. Borda’s circle [index entry]
8Thomas Jefferson to Bartholomew Fuller, 17 December 1819 (Jefferson Papers)
surveying; and J. C. Borda’s circle [index entry]