Coggins, James Caswell. The Eugenics of President Abraham Lincoln: His German-Scotch Ancestry Irrefutably Established from Recently Discovered Documents. Milligan College, TN: Goodwill Press, 1940.

Coggins, James Caswell. Abraham Lincoln, a North Carolinian; A True and Thrilling Story Never Before Published. Advocate Pub. Co., 1925.