The Subspecific Status of Two Central American Sloths

Pliocene and Pleistocene Records of Fossil Turtles from Western Kansas and Oklahoma University of Kansas Publications Museum of Natural History Volume 1

Systematic Status of a South American Frog, Allophryne ruthveni Gaige

Studies in Central American Picture-Writing First Annual Report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution, 1879-80, Government Printing Office, Washington, 1881, pages 205-245