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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Map of principal portion of Philadelphia" The New York Public Library Digital Collections. 1891. https://digitalcollections.nypl.org/items/00d10170-c40c-0135-f334-0734135d24ff
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Map of principal portion of Philadelphia" New York Public Library Digital Collections. Accessed October 16, 2024. https://digitalcollections.nypl.org/items/00d10170-c40c-0135-f334-0734135d24ff
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1891). Map of principal portion of Philadelphia Retrieved from https://digitalcollections.nypl.org/items/00d10170-c40c-0135-f334-0734135d24ff
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/00d10170-c40c-0135-f334-0734135d24ff | title=
(cartographic)
Map of principal portion of Philadelphia, (1891)
|author=Digital Collections, The New York Public Library |accessdate=October 16, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>