"Thomas Jefferson and Sally Hemings: A Brief Account", Plantation & Slavery, Monticello, Quote: "The DNA study found no link between the descendants of Field Jefferson [tested because Thomas Jefferson had no direct male descendants] and Thomas C. Woodson... But there is no indication in Jefferson's records of a child born to Hemings before 1795, and there are no known documents to support that Thomas Woodson was Hemings' first child.", accessed 6 March 2011. Erasure, Woodson, A President in the Family, 215-17.
https://journals.psu.edu/wph/article/view/60212/60161 Article about Jubilee of Freemen celebrations by Samuel W. Black, Director of African American Programs at the Heinz History Center published in Western Pennsylvania History