1Thomas Jefferson to Robert Patterson, 18 October 1818 (Jefferson Papers)
telescopes; repaired [index entry]
2Robert Patterson to Thomas Jefferson, 23 January 1819 (Jefferson Papers)
telescopes; repaired [index entry]
3Thomas Jefferson to William Davenport, 2 February 1819 (Jefferson Papers)
telescopes; repaired [index entry]
4Thomas Jefferson to Robert Patterson, 2 February 1819 (Jefferson Papers)
telescopes; repaired [index entry]
5Bernard Peyton to Thomas Jefferson, 4 May 1819 (Jefferson Papers)
telescopes; repaired [index entry]
6Thomas Jefferson to William Davenport, 4 July 1819 (Jefferson Papers)
telescopes; repaired [index entry]