1Thomas Jefferson to John W. Webster, 28 January 1820 (Jefferson Papers)
mineralogy; collections of minerals [index entry]
2Thomas Jefferson to Francis Bloodgood, 18 February 1820 (Jefferson Papers)
mineralogy; collections of minerals [index entry]
3Thomas Jefferson to Thomas Cooper, 8 April 1820 (Jefferson Papers)
mineralogy; collections of minerals [index entry]
4Thomas Jefferson to Robert Taylor and Chapman Johnson, 16 May 1820 (Jefferson Papers)
mineralogy; collections of minerals [index entry]
5Thomas Jefferson to Thomas Sumter, 23 July 1821 (Jefferson Papers)
mineralogy; collections of minerals [index entry]
6Thomas Jefferson to John Barnes, 10 September 1821 (Jefferson Papers)
mineralogy; collections of minerals [index entry]
7Thomas Jefferson to Daniel Brent, 11 September 1821 (Jefferson Papers)
mineralogy; collections of minerals [index entry]