Intrageneric relationships among colubrid snakes of the genus Geophis Wagler.
Ann Arbor: Museum of Zoology, University of Michigan, 1967. Octavo, softcover.
Miscellaneous Publications, Museum of Zoology, University of Michigan, No. 131.
Ann Arbor: Museum of Zoology, University of Michigan, 1967. Octavo, softcover.
Miscellaneous Publications, Museum of Zoology, University of Michigan, No. 131.