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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Geological sketch of Philadelphia & surroundings " The New York Public Library Digital Collections. 1885. https://digitalcollections.nypl.org/items/adf68fe0-5d0f-0136-a8da-2feb66a05d21
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Geological sketch of Philadelphia & surroundings " New York Public Library Digital Collections. Accessed October 8, 2024. https://digitalcollections.nypl.org/items/adf68fe0-5d0f-0136-a8da-2feb66a05d21
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1885). Geological sketch of Philadelphia & surroundings Retrieved from https://digitalcollections.nypl.org/items/adf68fe0-5d0f-0136-a8da-2feb66a05d21
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/adf68fe0-5d0f-0136-a8da-2feb66a05d21 | title=
(cartographic)
Geological sketch of Philadelphia & surroundings , (1885)
|author=Digital Collections, The New York Public Library |accessdate=October 8, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>