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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Geological map of Ohio " The New York Public Library Digital Collections. 1888. https://qa-digitalcollections.nypl.org/items/883dfde0-053e-0136-3570-0cd6349b96c4
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Geological map of Ohio " New York Public Library Digital Collections. Accessed November 22, 2024. https://qa-digitalcollections.nypl.org/items/883dfde0-053e-0136-3570-0cd6349b96c4
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1888). Geological map of Ohio Retrieved from https://qa-digitalcollections.nypl.org/items/883dfde0-053e-0136-3570-0cd6349b96c4
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/883dfde0-053e-0136-3570-0cd6349b96c4 | title=
(cartographic)
Geological map of Ohio , (1888)
|author=Digital Collections, The New York Public Library |accessdate=November 22, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>