1. Ames KM, Dumond DE, Galm JR, Minor R (1998) Prehistory of the southern Plateau. In: Walker DE (ed) Handbook of North American Indians, vol 12. Plateau. Smithsonian Institution, Washington, pp 103–119
2. Armstrong DM (1972) Distribution of mammals in Colorado, monograph of the museum of natural history, 3rd edn. University of Kansas, Lawrence
3. Bailey V (1931) Mammals of New Mexico. North American Fauna no. 53
4. Booth ES (1947) Systematic review of the land mammals of Washington. Unpublished PhD dissertation, State College of Washington, Washington State University, Pullman
5. Bryant LD, Maser C (1982) Classification and distribution. In: Thomas JW, Toweill DE (eds) Elk of North America: ecology and management. Stackpole, Harrisburg, Pennsylvania, pp 1–59