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© The New York Public Library, 2026
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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Petersen's new map of the Bronx, showing all present and proposed trolley and rapid transit lines." The New York Public Library Digital Collections. 1917. https://old-digitalcollections.nypl.org/items/df012010-010c-0131-627a-58d385a7bbd0
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Petersen's new map of the Bronx, showing all present and proposed trolley and rapid transit lines." New York Public Library Digital Collections. Accessed October 1, 2026. https://old-digitalcollections.nypl.org/items/df012010-010c-0131-627a-58d385a7bbd0
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1917). Petersen's new map of the Bronx, showing all present and proposed trolley and rapid transit lines. Retrieved from https://old-digitalcollections.nypl.org/items/df012010-010c-0131-627a-58d385a7bbd0
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/df012010-010c-0131-627a-58d385a7bbd0 | title=
(cartographic)
Petersen's new map of the Bronx, showing all present and proposed trolley and rapid transit lines., (1917)|author=Digital Collections, The New York Public Library |accessdate=October 1, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>