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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Topographical map of the coal and iron ore lands of the Cambria Iron Company " The New York Public Library Digital Collections. 1876. https://old-digitalcollections.nypl.org/items/109c9f30-90c2-0135-8f94-47ffcd481e75
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Topographical map of the coal and iron ore lands of the Cambria Iron Company " New York Public Library Digital Collections. Accessed September 27, 2026. https://old-digitalcollections.nypl.org/items/109c9f30-90c2-0135-8f94-47ffcd481e75
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1876). Topographical map of the coal and iron ore lands of the Cambria Iron Company Retrieved from https://old-digitalcollections.nypl.org/items/109c9f30-90c2-0135-8f94-47ffcd481e75
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/109c9f30-90c2-0135-8f94-47ffcd481e75 | title=
(cartographic)
Topographical map of the coal and iron ore lands of the Cambria Iron Company , (1876)
|author=Digital Collections, The New York Public Library |accessdate=September 27, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>