The Thomas Jefferson Genealogical Collection was developed in 1948 as a result of correspondence between Pearl M. Graham and Lucy Williams. Ms. Graham was researching a project which involved tracing the ancestry of Blacks who claimed to be direct-descendants of Thomas Jefferson. In Lucy William's letters to Pearl Graham she relates the historical tradition of Sally Hemings and her offspring, fathered by Thomas Jefferson, indicating genealogical relationships up to her own generation.
Staff, MSRC, "JEFFERSON, Thomas" (2015). Manuscript Division. 104.