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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Map of the vicinity of Philadelphia from actual surveys by D.J. Lake and S.N. Beers assisted by F.W. Beers, L.B. Lake & D.G. Beers" The New York Public Library Digital Collections. 1861. https://digitalcollections.nypl.org/items/7dde0070-bb4d-0135-8f2e-003fae5af33f
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Map of the vicinity of Philadelphia from actual surveys by D.J. Lake and S.N. Beers assisted by F.W. Beers, L.B. Lake & D.G. Beers" New York Public Library Digital Collections. Accessed January 15, 2025. https://digitalcollections.nypl.org/items/7dde0070-bb4d-0135-8f2e-003fae5af33f
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1861). Map of the vicinity of Philadelphia from actual surveys by D.J. Lake and S.N. Beers assisted by F.W. Beers, L.B. Lake & D.G. Beers Retrieved from https://digitalcollections.nypl.org/items/7dde0070-bb4d-0135-8f2e-003fae5af33f
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/7dde0070-bb4d-0135-8f2e-003fae5af33f | title=
(cartographic)
Map of the vicinity of Philadelphia from actual surveys by D.J. Lake and S.N. Beers assisted by F.W. Beers, L.B. Lake & D.G. Beers, (1861)
|author=Digital Collections, The New York Public Library |accessdate=January 15, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>