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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Topographical map of the state of Pennsylvania" The New York Public Library Digital Collections. 1862. https://digitalcollections.nypl.org/items/5b9ef970-c094-0134-e5bc-00505686a51c
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Topographical map of the state of Pennsylvania" New York Public Library Digital Collections. Accessed March 27, 2025. https://digitalcollections.nypl.org/items/5b9ef970-c094-0134-e5bc-00505686a51c
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1862). Topographical map of the state of Pennsylvania Retrieved from https://digitalcollections.nypl.org/items/5b9ef970-c094-0134-e5bc-00505686a51c
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/5b9ef970-c094-0134-e5bc-00505686a51c | title=
(cartographic)
Topographical map of the state of Pennsylvania, (1862)
|author=Digital Collections, The New York Public Library |accessdate=March 27, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>