Hay, O.P. (1929)
Second bibliography and catalogue of the fossil Vertebrata of North America. Carnegie Institution of Washington, 390(1), 1–916
Hay, O.P. (1912)
On an important specimen of Edestus; with description of a new species, Edestus mirus. Proceedings of the United States National Museum, 42, 31–38
Hay, O.P. (1909)
On the nature of Edestus and related genera, with descriptions of one new genus and three new species. Proceedings of the United States National Museum, 37(1699), 43–61
Hay, O.P. (1907)
A new genus and species of fossil shark related to Edestus LEIDY. Science, 26(653), 22–24
Hay, O.P. (1903)
On a collection of upper Cretaceous fishes from Mount Lebanon, Syria, with descriptions of four new genera and nineteen new species. Bulletin of the American Museum of Natural History, 19(10), 395–452
Hay, O.P. (1903)
Some Remarks on the Fossil Fishes of Mount Lebanon, Syria. American Naturalist, 37, 685–695
Hay, O.P. (1902)
Bibliography and catalogue of the fossil Vertebrata of North America. Bulletin of the United States Geological and Geographical Survey of the Territories, 179, 1–868
Hay, O.P. (1902)
Description of a new species of Cladodus (C. formosus) from the Devonian of Colorado. American Geologist, 30, 373–374
Hay, O.P. (1900)
Descriptions of some vertebrates of the Carboniferous age. Proceedings of the American Philosophical Society, 39, 96–123
Hay, O.P. (1899)
On some changes in the names, generic and specific, of certain fossil fishes. American Naturalist, 33, 783–792
Hay, O.P. (1895)
Description of a new species of Petalodus (P. securiger) from the Carboniferous of Illinois. Journal of Geology, 3(5), 561–564