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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Geological map of Berks County " The New York Public Library Digital Collections. 1884. https://digitalcollections.nypl.org/items/34e4b900-fabb-0134-8c6b-43eb5bbac41a
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Geological map of Berks County " New York Public Library Digital Collections. Accessed May 14, 2025. https://digitalcollections.nypl.org/items/34e4b900-fabb-0134-8c6b-43eb5bbac41a
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1884). Geological map of Berks County Retrieved from https://digitalcollections.nypl.org/items/34e4b900-fabb-0134-8c6b-43eb5bbac41a
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/34e4b900-fabb-0134-8c6b-43eb5bbac41a | title=
(cartographic)
Geological map of Berks County , (1884)
|author=Digital Collections, The New York Public Library |accessdate=May 14, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>