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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Pittsburgh & Western Pennsylvania " The New York Public Library Digital Collections. 1874 - 1885. https://qa-digitalcollections.nypl.org/items/61bf8240-d460-0135-a74a-67b1e4b6e9a7
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Pittsburgh & Western Pennsylvania " New York Public Library Digital Collections. Accessed November 25, 2024. https://qa-digitalcollections.nypl.org/items/61bf8240-d460-0135-a74a-67b1e4b6e9a7
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1874 - 1885). Pittsburgh & Western Pennsylvania Retrieved from https://qa-digitalcollections.nypl.org/items/61bf8240-d460-0135-a74a-67b1e4b6e9a7
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/61bf8240-d460-0135-a74a-67b1e4b6e9a7 | title=
(cartographic)
Pittsburgh & Western Pennsylvania , (1874 - 1885)
|author=Digital Collections, The New York Public Library |accessdate=November 25, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>