1Benjamin Smith Barton to Thomas Jefferson, 13 July 1810 (Jefferson Papers)
Kentucky; mammoth bones found in [index entry]
2Thomas Jefferson to Francis Adrian Van der Kemp, 17 January 1813 (Jefferson Papers)
Kentucky; mammoth bones found in [index entry]
3Caspar Wistar to Thomas Jefferson, 27 April 1815 (Jefferson Papers)
Kentucky; mammoth bones found in [index entry]
4Thomas Jefferson to James W. Wallace, 30 October 1817 (Jefferson Papers)
Kentucky; mammoth bones found in [index entry]