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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: Gerstein - University of Toronto (archive.org)
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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. Camels of the fossil genus Camelops
    By: Hay, Oliver Perry, 1846-1930
    Type: Article
    In: Proceedings of The United States National Museum
    Volume: 46
    Issue: 2025
    Date: 1913
    Page Range: 267--277
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  3. 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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  4. A collection of Pleistocene vertebrates from southwestern Texas
    By: Hay, Oliver Perry, 1846-1930
    Type: Article
    In: Proceedings of The United States National Museum
    Volume: 68
    Issue: 2625
    Date: 1926
    Page Range: 1--18
    View Article
  5. A contribution to the knowledge of the extinct sirenian Desmostylus hesperus Marsh
    By: Hay, Oliver Perry, 1846-1930
    Type: Article
    In: Proceedings of The United States National Museum
    Volume: 49
    Issue: 2113
    Date: 1915
    Page Range: 381--397
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  6. A contribution to the knowledge of the fishes of Kansas
    By: Hay, Oliver Perry, 1846-1930
    Type: Article
    In: Proceedings of the United States National Museum
    Volume: 10
    Issue: 624
    Date: 1887-07-02
    Page Range: 242--253
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  7. 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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  8. Description of two species of fossil turtles, Toxochelys stenopora and Christernon? interpositum, the latter hitherto unknown
    By: Hay, Oliver Perry, 1846-1930
    Type: Article
    In: Proceedings of The United States National Museum
    Volume: 36
    Issue: 1665
    Date: 1909
    Page Range: 191--196
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  9. 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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  10. Descriptions of some Pleistocene vertebrates found in the United States
    By: Hay, Oliver Perry, 1846-1930
    Type: Article
    In: Proceedings of The United States National Museum
    Volume: 58
    Issue: 2328
    Date: 1920
    Page Range: 83--146
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  11. Descriptions of species of Pleistocene Vertebrata, types or specimens of most of which are preserved in the United States National Musum
    By: Hay, Oliver Perry, 1846-1930
    Type: Article
    In: Proceedings of The United States National Museum
    Volume: 59
    Issue: 2391
    Date: 1921
    Page Range: 599--642
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  12. Descriptions of two extinct mammals of the order Xenarthra from the Pleistocene of Texas
    By: Hay, Oliver Perry, 1846-1930
    Type: Article
    In: Proceedings of The United States National Museum
    Volume: 51
    Issue: 2147
    Date: 1916
    Page Range: 107--123
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  13. Descriptions of two new species of tortoises from the Tertiary of the United States
    By: Hay, Oliver Perry, 1846-1930
    Type: Article
    In: Proceedings of The United States National Museum
    Volume: 22
    Issue: 1181
    Date: 1899
    Page Range: 21--24
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  14. Descriptions of Two Species of Extinct Tortoises, One New
    By: Hay, Oliver Perry, 1846-1930
    Type: Article
    In: Proceedings of The Academy of Natural Sciences of Philadelphia
    Volume: 54
    Date: 1902
    Page Range: 383--388
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  15. The extinct bisons of North America, with description of one new species, Bison regius
    By: Hay, Oliver Perry, 1846-1930
    Type: Article
    In: Proceedings of The United States National Museum
    Volume: 46
    Issue: 2021
    Date: 1913
    Page Range: 161--200
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  16. 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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  17. Further observations on some extinct elephants
    By: Hay, Oliver Perry, 1846-1930
    Type: Article
    In: Proceedings of The Biological Society of Washington
    Volume: 35
    Date: 1922
    Page Range: 97--101
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  18. A new fossil stickleback fish from Nevada
    By: Hay, Oliver Perry, 1846-1930
    Type: Article
    In: Proceedings of The United States National Museum
    Volume: 32
    Issue: 1528
    Date: 1907
    Page Range: 271--273
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  19. Occurrence of Scott's gray fox in probably recent cave deposits in Kentucky
    By: Hay, Oliver Perry, 1846-1930
    Type: Article
    In: Proceedings of The Biological Society of Washington
    Volume: 35
    Date: 1922
    Page Range: 53--54
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  20. On a collection of fishes from eastern Mississippi
    By: Hay, Oliver Perry, 1846-1930
    Type: Article
    In: Proceedings of the United States National Museum
    Volume: 3
    Issue: 179
    Date: 1881-02-23
    Page Range: 488--515
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  21. On the breeding habits, eggs, and young of certain snakes
    By: Hay, Oliver Perry, 1846-1930
    Type: Article
    In: Proceedings of The United States National Museum
    Volume: 15
    Issue: 909
    Date: 1892
    Page Range: 385--397
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  22. On the ejection of blood from the eyes of horned toads
    By: Hay, Oliver Perry, 1846-1930
    Type: Article
    In: Proceedings of The United States National Museum
    Volume: 15
    Issue: 907
    Date: 1892
    Page Range: 375--378
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  23. 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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  24. 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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  25. On the nature of Edestus and related genera, with descriptions of one new genus and three new species
    By: Hay, Oliver Perry, 1846-1930
    Type: Article
    In: Proceedings of The United States National Museum
    Volume: 37
    Issue: 1699
    Date: 1909
    Page Range: 43--61
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  26. On the skull and the brain of Triceratops, with notes on the brain-cases of Iguanodon and Megalosaurus
    By: Hay, Oliver Perry, 1846-1930
    Type: Article
    In: Proceedings of The United States National Museum
    Volume: 36
    Issue: 1660
    Date: 1909
    Page Range: 95--108
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  27. 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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  28. 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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  29. 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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  30. 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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  31. 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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  32. Some observations on the turtles of the genus Malaclemys
    By: Hay, Oliver Perry, 1846-1930
    Type: Article
    In: Proceedings of The United States National Museum
    Volume: 15
    Issue: 908
    Date: 1892
    Page Range: 379--383
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