1Rodolph Schaer to Thomas Jefferson, 25 March 1819 (Jefferson Papers)
Cleaveland, Parker; An Elementary Treatise on Mineralogy and Geology [index entry]
2Enclosure: David M. Randolph (ca. 1759–1830) to James Gibbon, 6 January 1822, enclosure no. 1 in Richard Randolph to … (Jefferson Papers)
Cleaveland, Parker; An Elementary Treatise on Mineralogy and Geology [index entry]
3Enclosure: David M. Randolph (ca. 1759–1830) to James Gibbon, 8 January 1822, enclosure no. 2 in Richard Randolph to … (Jefferson Papers)
Cleaveland, Parker; An Elementary Treatise on Mineralogy and Geology [index entry]