1Lafayette to Thomas Jefferson, 16 September 1809 (Jefferson Papers)
Livingston, Robert R.; and merino sheep [index entry]
2Thomas Jefferson to Isaac A. Coles, 29 November 1809 (Jefferson Papers)
Livingston, Robert R.; and merino sheep [index entry]
3Thomas Jefferson to Robert R. Livingston, 20 April 1812 (Jefferson Papers)
Livingston, Robert R.; and merino sheep [index entry]
4John Adams to Thomas Jefferson, 15 September 1813 (Jefferson Papers)
Livingston, Robert R.; and merino sheep [index entry]