1Thomas Jefferson to William J. Coffee, 27 October 1818 (Jefferson Papers)
cement; minerals for [index entry]
2Enclosure: David M. Randolph (ca. 1759–1830) to James Gibbon, 6 January 1822, enclosure no. 1 in Richard Randolph to … (Jefferson Papers)
cement; minerals for [index entry]
3Enclosure: David M. Randolph (ca. 1759–1830) to James Gibbon, 8 January 1822, enclosure no. 2 in Richard Randolph to … (Jefferson Papers)
cement; minerals for [index entry]
4Richard Young to Thomas Jefferson, 11 May 1820 (Jefferson Papers)
cement; minerals for [index entry]