On certain portions of the skeleton of Protostega gigasOliver Perry Hay · First published 1895Open the Tome
The Batrachians and Reptiles of IndianaOliver Perry Hay · First published 1892 · Latest edition 2018Open the Tome
The Fossil Turtles of North AmericaOliver Perry Hay · First published 1908 · Latest edition 2018Open the Tome
Second bibliography and catalogue of the fossil Vertebrata of North AmericaOliver Perry Hay · First published 1929Open the Tome
Descriptions of some Pleistocene vertebrates found in the United StatesOliver Perry Hay · First published 1921Open the Tome
Descriptions of some fossil vertebrates found in TexasOliver Perry Hay · First published 1916Open the Tome
Contributions to the knowledge of the mammals of the Pleistocene of North AmericaOliver Perry Hay · First published 1915Open the Tome
Description of the skull of an extinct horse, found in central AlaskaOliver Perry Hay · First published 1913Open the Tome
Bibliography and catalogue of the fossil vertebrata of North AmericaOliver Perry Hay · First published 1902Open the Tome
On some collections of fishes made in the Kankakee and Illinois RiversOliver Perry Hay · First published 1896Open the Tome
On the structure and development of the vertebral column of AmiaOliver Perry Hay · First published 1895Open the Tome
The batrachians and reptiles of the State of IndianaOliver Perry Hay · First published 1892Open the Tome
