1Thomas Jefferson to Francis W. Gilmer, 14 October 1817 (Jefferson Papers)
chemistry; study of [index entry]
2Thomas Jefferson to Benjamin Waterhouse, 3 March 1818 (Jefferson Papers)
chemistry; study of [index entry]
3Peter S. Du Ponceau to Thomas Jefferson, 9 October 1820 (Jefferson Papers)
chemistry; study of [index entry]
4John Vaughan to Thomas Jefferson, 11 October 1820 (Jefferson Papers)
chemistry; study of [index entry]