U.S. Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station. Responses of birds and small mammals to clearcutting in a subalpine forest in central Colorado. U.S. Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station. American Midland Naturalist. Shiflet, Thomas N., ed.
Rangeland cover types of the United States.
Society for Range Management. Black bear damage to old-growth trees around middens of Mount Graham red squirrels. Sullivan, Thomas P. 1990. Journal of Mammalogy. Red squirrel populations in natural and managed stands of lodgepole pine.