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
Third contribution to the history of the vertebrata of the Permian formation of Texas, Synopsis of the vertebrata of the Puerco Eocene epoch, and On the systematic relations of the carnivora-fissipedia