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Cole.G.F. 1971. Yellowstone Wolves . Research Note No. 4, Yellowstone National 



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 Cowan, I. M. 1947. The Timber Wolf in the Rocky Mountain National Parks of 



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 Goldman, E. A. 1944. The Wolves of North America . Part II. Classification of 



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 Mech, L. D. 1970. The Wolf. Doubleday Publishing Co. , N.Y ., 389 pp . 

 U.S.D.A. Forest Service. 1970. Estimates of Big Game Animals on National 



Forests and National Grasslands. April 30, 1970. 



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