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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/c1a93840-faba-0134-ee42-63fe8fcd15da
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Geological map of Berks County " New York Public Library Digital Collections. Accessed April 25, 2024. https://digitalcollections.nypl.org/items/c1a93840-faba-0134-ee42-63fe8fcd15da
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/c1a93840-faba-0134-ee42-63fe8fcd15da
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/c1a93840-faba-0134-ee42-63fe8fcd15da | title=
(cartographic)
Geological map of Berks County , (1884)
|author=Digital Collections, The New York Public Library |accessdate=April 25, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>