Beale, Calvin L. “American Tri-Racial Isolates: Their Status and Pertinence to Genetic Research.” Eugenics Quarterly 4.4 (Dec. 1957): 187-96.
Defines triracial isolates. Lumbees are living in these counties: Evans and Richmond (GA); St. Marys (MD); Dillon, Marion and Marlboro (SC); and Bladen, Columbus, Cumberland, Harnett, Hoke, Robeson, Sampson, Scotland and Wayne (NC).
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