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Report discussing a study on four beds of uranium-bearing lignite from the Slim Buttes area of Harding County, South Dakota.
Schopf, James M. & Gray, Ralph J. February 1954.
Aug. 22, 2018, 2:28 p.m.
Schopf, James M. & Gray, Ralph J. Microscopic Studies of Uraniferous Coal Deposits -- a Progress Report, report, February 1954; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc1050402/: accessed April 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.