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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Geological map of the state of Pennsylvania" The New York Public Library Digital Collections. 1858. https://qa-digitalcollections.nypl.org/items/e1f7c110-292c-0135-552b-08194ae2ef4a
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Geological map of the state of Pennsylvania" New York Public Library Digital Collections. Accessed November 26, 2024. https://qa-digitalcollections.nypl.org/items/e1f7c110-292c-0135-552b-08194ae2ef4a
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1858). Geological map of the state of Pennsylvania Retrieved from https://qa-digitalcollections.nypl.org/items/e1f7c110-292c-0135-552b-08194ae2ef4a
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/e1f7c110-292c-0135-552b-08194ae2ef4a | title=
(cartographic)
Geological map of the state of Pennsylvania, (1858)
|author=Digital Collections, The New York Public Library |accessdate=November 26, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>