February 7, 1786 | Letter John Ledyard to Thomas Jefferson, February 7, 1786 John Ledyard warns Thomas Jefferson that Native accounts of fossil origins may not be reliable.
August 16, 1786 | Letter Thomas Jefferson to John Ledyard, August 16, 1786 Thomas Jefferson writes to John Ledyard expressing hopes that his explorations will prove useful.
January 7, 1788 | Letter John Ledyard to Thomas Jefferson, July 1788 The renowned explorer shares his thoughts on racial/ethnic differences, and the possibility of Noah's Flood as an explanation for human diversity.
Banner image: From the Collection of The New-York Historical Society. Accession number 1867.306.
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