1. On the short footed ungulata of the Eocene of Wyoming Author(s): Cope, E. D. (Edward Drinker), 1840-1897, author Publication: [Philadelphia?] : [publisher not identified], [1873?] Subject(s): Mammals -- anatomy & histologyFossilsWyoming
2. Contributions to the history of the vertebrata of the Lower Eocene of Wyoming and New Mexico made during 1881 Author(s): Cope, E. D. (Edward Drinker), 1840-1897, author Publication: [Philadelphia?] : [publisher not identified], [1882?] Subject(s): VertebratesPaleontologyWyomingNew Mexico