Hemmingsen, Alan R.; Bellerud, Blane L. & Gunckel, Stephanie L. Bull Trout Life History, Genetics, Habitat Needs, and Limiting Factors in Central and Northeast Oregon, Annual Report 1998., report, March 1, 2001; (https://digital.library.unt.edu/ark:/67531/metadc718192/m1/1/: accessed September 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .