Oliver Perry Hay

• A Contribution To The Knowledge Of The Extinct Sirenian Desmostylus Hesperus Marsh
• Bibliography and Catalogue of the Fossil Vertebrata of North America
• The Batrachians and Reptiles of Indiana
• The Fossil Turtles of North America
• Chondrocranium, Amphibia - Miscellaneous Papers
• On Certain Portions of the Skeleton of Protostega Gigas
• Pleistocene of North America and Its Vertebrated Animals Form the States East of the Mississippi River and Form the Canadian Provinces East of Longitude 95