1Thomas Jefferson to Charles Willson Peale, 5 May 1809 (Jefferson Papers)
mastodon (mammoth, Ohio); bones analyzed by Institut de France [index entry]
2Charles Willson Peale to Thomas Jefferson, 3 April 1809 (Jefferson Papers)
mastodon (mammoth, Ohio); bones analyzed by Institut de France [index entry]
3Thomas Jefferson to Caspar Wistar, 31 March 1809 (Jefferson Papers)
mastodon (mammoth, Ohio); bones analyzed by Institut de France [index entry]
4Lacépède to Thomas Jefferson, 31 May 1809 (Jefferson Papers)
mastodon (mammoth, Ohio); bones analyzed by Institut de France [index entry]