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