North American Fauna No. 47: Revision of the American Pikas.
Washington, D. C.: Government Printing Office, 1924. 8vo. 57 pp + 6 plates. Library stamps and marks on cover. Cover lightly worn at edges. B&w photos and diagrams. From the U. S. Department of Agriculture Bureau of Biological Survey. Biology journal from the 1920's, focusing on the pikas of America. Good Paperback (Item ID: 24951)