Freeman, Lewis R. Down the Yellowstone. New York: Dodd, Mead and Co., 1922.
Goad, Edgar F. “Bandelier, Scholar of the Mesas.” Washington, D.C.: Department of Interior Information Service, 1940.
Haines, Francis. Red Eagles of the Northwest. Portland, Oregon: The Scholastic Press, 1939.
Harris, Burton. John Colter, His Years in the Rockies. New York: Charles Scribner’s Sons, 1952.
Hebard, Grace R. and Brininstool, E. A. The Bozeman Trail. Cleveland, Ohio: Arthur H. Clark Co., 1922.
Hemishunmeres, Mourning Dove. Coyote Stories. Caldwell, Idaho: Caxton Printers, 1933.
Hornaday, William T. Our Vanishing Wild Life. New York: New York Zoological Society, 1913.
Huth, Hans. Yosemite, The Story of an Idea. Reprint from the Sierra Club Bulletin, March, 1948.
Kieley, James F. A Brief History of the National Park Service. Washington, D.C.: United States Department of Interior, 1940.
Lillard, Richard G. The Great Forest. New York: Alfred A. Knopf, 1948.