You ought to check out "The Jefferson Lies" by David Barton. he does a pretty good job refuting the case that Thomas Jefferson fathered any children with Sally Hemmings. A Jefferson male fathered Eston, but that male was more than likely not TJ.
(not trying to put TJ on a pedestal, just like to play devil's advocate and I thought it was an interesting read)
Another good one you might like is "Emancipating Slaves, Enslaving Free Men" by Jeffrey Hummel -- it's an alternative history to the Civil War that Hummel painstakingly researched and documented. After each chapter there is an additional essay on the sources used in that chapter!
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