The Book of the National Parks. 1926. 444 pp., 74 illustrations, 14 maps and diagrams. Scribners.
Rocky Mountain National Park on pp. 93-117.
Wilbur, Ray Lyman, and Du Puy, William Atherton. Conservation in the Department of the Interior.
Chapter on national parks, pp. 96-112. Illustrated. Government Printing Office, Washington, D.C. 1931.
Yeager, Dorr G.:
Bob Flame, Rocky Mountain Ranger. 1935. Illustrated. Dodd, Mead & Co., New York.
Scarface, the Story of a Grizzly. 1935. Illustrated. Penn, Phila.
Yelm, Betty, and Beals, Ralph L. Indians of the Park Region. 1934. 52 pp. Rocky Mountain Nature Association.
