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  1. The batrachians and reptiles of the State of Indiana / by Oliver Perry Hay.
    By: Hay, Oliver Perry,
    Publication info: Indianapolis :Wm. B. Burford,1892.
    Contributed by: Smithsonian Libraries
    BHL Collections: Smithsonian Libraries
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  2. The batrachians and reptiles of the State of Indiana / by Oliver Perry Hay.
    By: Hay, Oliver Perry,
    Publication info: Indianapolis :Wm. B. Burford,1892.
    Contributed by: Harvard University, MCZ, Ernst Mayr Library
    BHL Collections: Ernst Mayr Library of the MCZ, Harvard University
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  3. Bibliography and catalogue of the fossil vertebrata of North America, by Oliver Perry Hay.
    By: Hay, Oliver Perry,
    Publication info: Washington :Govt. Print. Off.,1902.
    Contributed by: University of California Libraries (archive.org)
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  4. The fossil turtles of North America, by Oliver Perry Hay.
    By: Hay, Oliver Perry,
    Publication info: Washington, D.C. :Pub. by the Carnegie Institution of Washington,1908.
    Contributed by: University of California Libraries (archive.org)
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  5. The fossil turtles of North America, by Oliver Perry Hay.
    By: Hay, Oliver Perry,
    Publication info: Washington, D.C.,Pub. by the Carnegie Institution of Washington,1908.
    Contributed by: Smithsonian Libraries
    BHL Collections: Smithsonian Libraries
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  6. On certain portions of the skeleton of Protostega gigas [by] O. P. Hay.
    By: Hay, Oliver Perry,
    Publication info: Chicago,1895
    Contributed by: University of Illinois Urbana Champaign
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  7. On some collections of fishes made in the Kankakee and Illinois Rivers [by] O. P. Hay.
    By: Hay, Oliver Perry,
    Publication info: Chicago,1896
    Contributed by: University of Illinois Urbana Champaign
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  8. On the manner of locomotion of the dinosaurs, especially Diplodocus, with remarks on the origin of the birds, by Oliver P. Hay ...
    By: Hay, Oliver Perry,
    Publication info: Baltimore, Md. :Williams & Wilkins company,1910.
    Contributed by: University of California Libraries (archive.org)
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  9. On the skeleton of Toxochelys latiremis [by] O. P. Hay.
    By: Hay, Oliver Perry,
    Publication info: Chicago,1896
    Contributed by: University of Illinois Urbana Champaign
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  10. On the structure and development of the vertebral column of Amia [by] O. P. Hay.
    By: Hay, Oliver Perry,
    Publication info: Chicago,1895
    Contributed by: University of Illinois Urbana Champaign
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  11. The 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 .
    By: Hay, Oliver Perry,
    Publication info: WashingtonCarnegie Institution of Washington1923
    Contributed by: Gerstein - University of Toronto (archive.org)
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  12. The Pleistocene of the middle region of North America and its vertebrated animals /
    By: Hay, Oliver Perry,
    Publication info: Washington :The Carnegie institution of Washington,1924.
    Contributed by: ASC - York University Libraries (archive.org)
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  13. The recognition of Pleistocene faunas, by Oliver P. Hay.
    By: Hay, Oliver Perry,
    Publication info: Washington :Smithsonian Institution,1912.
    Contributed by: University of California Libraries (archive.org)
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