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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Survey of the Allegheny River from Franklin to Pittsburgh " The New York Public Library Digital Collections. 1828. https://qa-digitalcollections.nypl.org/items/5db585c0-7edf-0135-b431-3f3a5a1abab7
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Survey of the Allegheny River from Franklin to Pittsburgh " New York Public Library Digital Collections. Accessed November 22, 2024. https://qa-digitalcollections.nypl.org/items/5db585c0-7edf-0135-b431-3f3a5a1abab7
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1828). Survey of the Allegheny River from Franklin to Pittsburgh Retrieved from https://qa-digitalcollections.nypl.org/items/5db585c0-7edf-0135-b431-3f3a5a1abab7
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/5db585c0-7edf-0135-b431-3f3a5a1abab7 | title=
(cartographic)
Survey of the Allegheny River from Franklin to Pittsburgh , (1828)
|author=Digital Collections, The New York Public Library |accessdate=November 22, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>