Brill, Kenneth G., Jr.; Nelson, John M. & Prouty, Chilton E. Preliminary Report Trace Elements Investigations Hickman and Adjacent Counties, Tenn., report, February 1945; (https://digital.library.unt.edu/ark:/67531/metadc1050699/m1/1/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .