1. The classification of the ungulate mammalia: Third contribution to the history of the vertebrata of the Permian formation of Texas ; Synopsis of the vertebrata of the Puerco Eocene epoch ; On the systematic relations of the carnivora-fissipedia Author(s): Cope, E. D. (Edward Drinker), 1840-1897, author Publication: [Philadelphia?] : [publisher not identified], [1882?] Subject(s): VertebratesFossils