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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
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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, Museum of Comparative Zoology, Ernst Mayr Library
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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. Descriptions of seven new species of turtles from the Tertiary of the United States. Bulletin of the AMNH ; v. 23, article 34.
    By: Hay, Oliver Perry,
    Publication info: New York : Published by order of the Trustees, American Museum of Natural History 1907
    Contributed by: American Museum of Natural History Library
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  5. Descriptions of two new genera (Echmatemys and Xenochelys) and two new species (Xenochelys formosa and Terrapene putnami) of fossil turtles. Bulletin of the AMNH ; v. 22, article 3.
    By: Hay, Oliver Perry,
    Publication info: New York : Published by order of the Trustees, American Museum of Natural History 1906
    Contributed by: American Museum of Natural History Library
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  6. 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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  7. 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
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  8. On a collection of Upper Cretaceous fishes from Mount Lebanon, Syria, with descriptions of four new genera and nineteen new species. Bulletin of the AMNH ; v. 19, article 10.
    By: American University of Beirut. - Day, Alfrid. - Hay, Oliver Perry,
    Publication info: New York : Published by order of the Trustees, American Museum of Natural History 1903
    Contributed by: American Museum of Natural History Library
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  9. On certain genera and species of North American Cretaceous actinopterous fishes. Bulletin of the AMNH ; v. 19, article 1
    By: Cope, E. D. - Hay, Oliver Perry,
    Publication info: New York : Published by order of the Trustees, American Museum of Natural History 1903
    Contributed by: American Museum of Natural History Library
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  10. On certain portions of the skeleton of Protostega gigas [by] O. P. Hay.
    By: Hay, Oliver Perry,
    Publication info: Chicago,1895
    Contributed by: University Library, University of Illinois Urbana Champaign
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  11. 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 Library, University of Illinois Urbana Champaign
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  12. On the group of fossil turtles known as the Amphichelydia ; with, Remarks on the origin and relationships of the suborders, superfamilies, and families of testudines. Bulletin of the AMNH ; v. 21, article 9.
    By: Hay, Oliver Perry,
    Publication info: New York : Published by order of the Trustees, American Museum of Natural History 1905
    Contributed by: American Museum of Natural History Library
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  13. 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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  14. On the skeleton of Toxochelys latiremis [by] O. P. Hay.
    By: Hay, Oliver Perry,
    Publication info: Chicago,1896
    Contributed by: University Library, University of Illinois Urbana Champaign
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  15. On the skull of a new trionychid, Conchochelys admirabilis, from the Puerco beds of New Mexico. Bulletin of the AMNH ; v. 21, article 21.
    By: Hay, Oliver Perry, - Wortman, Jacob Lawson.
    Publication info: New York : Published by order of the Trustees, American Museum of Natural History 1905
    Contributed by: American Museum of Natural History Library
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  16. 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 Library, University of Illinois Urbana Champaign
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  17. On two interesting genera of Eocene turtles, Chisternon Leidy and Anosteira Leidy. Bulletin of the AMNH ; v. 22, article 9.
    By: Hay, Oliver Perry,
    Publication info: New York : Published by order of the Trustees, American Museum of Natural History 1906
    Contributed by: American Museum of Natural History Library
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  18. 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: University of Toronto - Gerstein
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  19. 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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  20. 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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  21. A revision of the species of the family of fossil turtles called Toxochelyidae, with descriptions of two new species of Toxochelys and a new species of Porthochelys. Bulletin of the AMNH ; v. 21, article 10.
    By: Brown, Barnum. - Hay, Oliver Perry,
    Publication info: New York : Published by order of the Trustees, American Museum of Natural History 1905
    Contributed by: American Museum of Natural History Library
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  1. Again on Pleistocene Man at Vero, Florida
    By: Hay, Oliver Perry, 1846-1930
    Type: Article
    In: Journal of The Washington Academy of Sciences
    Volume: 18
    Date: 1928
    Page Range: 233--241
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  2. Characteristic mammals of the early Pleistocene
    By: Hay, Oliver Perry, 1846-1930
    Type: Article
    In: Jour Washington Acad Sci
    Volume: 18
    Date: 1928
    Page Range: 421--430
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  3. Description of some fossil vertebrates from the Upper Miocene of Texas
    By: Hay, Oliver Perry, 1846-1930
    Type: Article
    In: Proceedings of The Biological Society of Washington
    Volume: 37
    Date: 1924
    Page Range: 1--19
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  4. Descriptions of some mammalian and fish remains from Florida of probably Pleistocene age
    By: Hay, Oliver Perry, 1846-1930
    Type: Article
    In: Proceedings of The United States National Museum
    Volume: 56
    Issue: 2291
    Date: 1919
    Page Range: 103--112
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  5. Further consideration of the shell of Chelys and of the constitution of the armor of turtles in general
    By: Hay, Oliver Perry, 1846-1930
    Type: Article
    In: Proceedings of the United States National Museum
    Volume: 73
    Issue: 2724
    Date: 1928
    Page Range: 1--12
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  6. On the Finding of the Bones of the Great Auk (Plautus impennis) in Florida
    By: Hay, Oliver Perry, 1846-1930
    Type: Article
    In: The Auk
    Volume: 19
    Date: 1902
    Page Range: 255--258
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  7. On the fossil Mammalia of the first interglacial stage of the Pleistocene of the United States
    By: Hay, Oliver Perry, 1846-1930
    Type: Article
    In: Jour Washington Acad Sci
    Volume: 20
    Date: 1930
    Page Range: 501--509
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  8. On the status of privately issued papers on systematic zoology
    By: Hay, Oliver Perry, 1846-1930
    Type: Article
    In: Proceedings of The Biological Society of Washington
    Volume: 37
    Date: 1924
    Page Range: 109--112
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  9. The Red-Headed Woodpecker a Hoarder
    By: Hay, Oliver Perry, 1846-1930
    Type: Article
    In: The Auk
    Volume: 4
    Date: 1887
    Page Range: 193--196
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  10. Remarks on Dr. George G. Simpson's work on the Pleistocene paleontology of Florida
    By: Hay, Oliver Perry, 1846-1930
    Type: Article
    In: Jour Washington Acad Sci
    Volume: 20
    Date: 1930
    Page Range: 331--340
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  11. Review of Dr. Gunther Schlesinger's paper on Masto-dons
    By: Hay, Oliver Perry, 1846-1930
    Type: Article
    In: Journal of The Washington Academy of Sciences
    Volume: 15
    Date: 1925
    Page Range: 381--387
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  12. A revision of the Pleistocene period in North America, based specially on glacial geology and vertebrate paleontology
    By: Hay, Oliver Perry, 1846-1930
    Type: Article
    In: Journal of The Washington Academy of Sciences
    Volume: 15
    Date: 1925
    Page Range: 126--133
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