Bradley, Dwight C. & Ford, Arthur B. Geologic Studies in Alaska by the U.S. Geological Survey, 1990, report, 1992; (https://digital.library.unt.edu/ark:/67531/metadc1115068/m1/1/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .