1Thomas Jefferson to Henry A. S. Dearborn, 15 November 1811 (Jefferson Papers)
scientific instruments; equatorials [index entry]
2Thomas Jefferson to Bishop James Madison, 29 December 1811 (Jefferson Papers)
scientific instruments; equatorials [index entry]
3Thomas Jefferson to Isaac Briggs, 17 April 1816 (Jefferson Papers)
scientific instruments; equatorials [index entry]
4Thomas Jefferson to Wilson Cary Nicholas, 19 April 1816 (Jefferson Papers)
scientific instruments; equatorials [index entry]
5Thomas Jefferson to Bartholomew Fuller, 17 December 1819 (Jefferson Papers)
scientific instruments; equatorials [index entry]