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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Map of North Allegheny, showing outcrops of the Pittsburgh and Upper Freeport coals " The New York Public Library Digital Collections. 1877. https://digitalcollections.nypl.org/items/d282baf0-fab2-0134-0eca-0a3343d5b15e
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Map of North Allegheny, showing outcrops of the Pittsburgh and Upper Freeport coals " New York Public Library Digital Collections. Accessed December 6, 2024. https://digitalcollections.nypl.org/items/d282baf0-fab2-0134-0eca-0a3343d5b15e
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1877). Map of North Allegheny, showing outcrops of the Pittsburgh and Upper Freeport coals Retrieved from https://digitalcollections.nypl.org/items/d282baf0-fab2-0134-0eca-0a3343d5b15e
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/d282baf0-fab2-0134-0eca-0a3343d5b15e | title=
(cartographic)
Map of North Allegheny, showing outcrops of the Pittsburgh and Upper Freeport coals , (1877)
|author=Digital Collections, The New York Public Library |accessdate=December 6, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>