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Good afternoon,
Researching the past hour as have not found any mention by the author of an proof of an affair with one of his slaves.
One book in question has a thought on such an affair if at all possible as no proof seems to exist
https://books.google.com/books?id=MauDCgAAQBAJ&pg=PT125&lpg=PT125&dq=dolly+affair+andrew+johnson&source=bl&ots=510HHnd_fe&sig=ACfU3U2C4iDi5rRVnIryxTKpqNZC6F_PFA&hl=en&sa=X&ved=2ahUKEwjnhc-5yN3kAhXDup4KHTibCSk4ChDoATADegQIBhAB#v=onepage&q=dolly%20affair%20andrew%20johnson&f=false
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Take care,
Librarian Michael