An annotated checklist and key to the amphibia of Mexico.
Washington: Smithsonian Institution, Bulletin 194,1950. Octavo, wrappers, few pale library stamps, edges uncut, good copy. More
Washington: Smithsonian Institution, Bulletin 194,1950. Octavo, wrappers, few pale library stamps, edges uncut, good copy. More
Boulder: University of Colorado Press, 1965. Octavo, wrappers, maps. University of Colorado Studies, Series in Biology, number 15. More