1Thomas Cooper to Thomas Jefferson, 15 September 1814 (Jefferson Papers)
natural philosophy; study of [index entry]
2Thomas Cooper to Thomas Jefferson, 22 September 1814 (Jefferson Papers)
natural philosophy; study of [index entry]
3John Adams to Thomas Jefferson, 2 March 1816 (Jefferson Papers)
natural philosophy; study of [index entry]
4John F. Watson to Thomas Jefferson, [ca. 22 October 1816] (Jefferson Papers)
natural philosophy; study of [index entry]
5Patrick Kerr Rogers to Thomas Jefferson, 21 May 1819 (Jefferson Papers)
natural philosophy; study of [index entry]