Descriptions of extinct batrachia and reptilia from the Permian Formation of Texas - Cope, E. D. (Edward Drinker),; American Philosophical Society. (American Philosophical Society, 1878)
Cover title. --- "Paleontological bulletin, no. 29." --- "Read before the American Philosophical Society, April 5th, 1878." --- "Published May 8, 1878"--P. 530.
Keywords: Amphibians; Classification; Fossils; Geological Phenomena; Reptiles; Texas