- Cărți electronicePliocene and Pleistocene Records of Fossil Turtles from Western Kansas and Oklahoma University of Kansas Publications Museum of Natural History Volume 1E. Raymond (Eugene Raymond) Hall
- Cărți electroniceA New Extinct Emydid Turtle from the Lower Pliocene of OklahomaEdwin C. Galbreath
- Cărți electroniceA New Species of Heteromyid Rodent from the Middle Oligocene of Northeast Colorado with Remarks on the SkullEdwin C. Galbreath