1Robert Bakewell to Thomas Jefferson, 23 December 1810 (Jefferson Papers)
mineralogy; books on [index entry]
2Louis H. Girardin to Thomas Jefferson, 19 April 1815 (Jefferson Papers)
mineralogy; books on [index entry]
3Rodolph Schaer to Thomas Jefferson, 25 March 1819 (Jefferson Papers)
mineralogy; books on [index entry]
4John R. Cotting to Thomas Jefferson, 20 January 1821 (Jefferson Papers)
mineralogy; books on [index entry]