1Thomas Jefferson to Thomas Sumter, 23 July 1821 (Jefferson Papers)
Brazil; minerals from [index entry]
2Daniel Brent to Thomas Jefferson, 5 September 1821 (Jefferson Papers)
Brazil; minerals from [index entry]
3Thomas Jefferson to John Barnes, 10 September 1821 (Jefferson Papers)
Brazil; minerals from [index entry]
4Thomas Jefferson to Daniel Brent, 11 September 1821 (Jefferson Papers)
Brazil; minerals from [index entry]
5John Barnes to Thomas Jefferson, 18 September 1821 (Jefferson Papers)
Brazil; minerals from [index entry]
6Daniel Brent to Thomas Jefferson, 23 September 1821 (Jefferson Papers)
Brazil; minerals from [index entry]