Al-Shaieb, Zuhair; Shelton, John W.; Donovan, R. Nowell; Hanson, Richard E. & May, Richard T. Evaluation of Uranium Potential in Selected Pennsylvanian and Permian Units and Igneous Rocks in Southwestern and Southern Oklahoma: Enclosures for Final Report, report, June 15, 1977; (https://digital.library.unt.edu/ark:/67531/metadc784583/m1/1/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .