U. S. Department of Agriculture Bureau of Biological Survey, North American Fauna No. 48 (October 12, 1926) : Voles of the Genus Phenacomys; I. Revision of the Genus Phenacomys; II. Life History of the Red Tree Mouse (Phenacomys Longicaudus).
Softcover, Washington, D. C. Government Printing Office, 1926. Good with no dust jacket.