1Thomas Jefferson to Robert Patterson, 21 March 1811 (Jefferson Papers)
scientific instruments; telescopes [index entry]
2Thomas Jefferson to Robert Patterson, 27 December 1812 (Jefferson Papers)
scientific instruments; telescopes [index entry]
3Thomas Jefferson to Robert Patterson, 18 October 1818 (Jefferson Papers)
scientific instruments; telescopes [index entry]
4Thomas Jefferson to Robert Patterson, 2 February 1819 (Jefferson Papers)
scientific instruments; telescopes [index entry]