Nelson, J. M. & Brill, K. G., Jr. Radioactivity of Asphaltites, Coals, and Shales in Tennessee, Kentucky, West Virginia, and Pennsylvania, report, October 1948; (https://digital.library.unt.edu/ark:/67531/metadc1050679/m1/3/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .

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