Forbes, Robert B.; Carden, John R. & Zdepski, J. Mark. The Origin of Low-Level Airborne Radiometric Anomalies in the Copper River Basin Region, Alaska, report, May 1977; (https://digital.library.unt.edu/ark:/67531/metadc784612/m1/3/: accessed December 10, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .