Van Eeckhout, Edward Mathias; Warren, Richard G. & Hill, Dwight E. Uranium Hydrogeochemical and Stream Sediment Reconnaissance of the Medfra and Mt. McKinley NTMS Quadrangles, Alaska, Including Concentrations of Forty-Three Additional Elements, report, February 1979; (https://digital.library.unt.edu/ark:/67531/metadc100945/m1/1/: accessed May 20, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .