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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Topographical map in thirty-foot contour curves of the Buffalo Coal Company's tract in the vicinity of Clermont, Sergeant Township, McKean County" The New York Public Library Digital Collections. 1879. https://digitalcollections.nypl.org/items/1318e820-c0ab-0134-3ab1-00505686a51c
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Topographical map in thirty-foot contour curves of the Buffalo Coal Company's tract in the vicinity of Clermont, Sergeant Township, McKean County" New York Public Library Digital Collections. Accessed April 24, 2024. https://digitalcollections.nypl.org/items/1318e820-c0ab-0134-3ab1-00505686a51c
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1879). Topographical map in thirty-foot contour curves of the Buffalo Coal Company's tract in the vicinity of Clermont, Sergeant Township, McKean County Retrieved from https://digitalcollections.nypl.org/items/1318e820-c0ab-0134-3ab1-00505686a51c
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/1318e820-c0ab-0134-3ab1-00505686a51c | title=
(cartographic)
Topographical map in thirty-foot contour curves of the Buffalo Coal Company's tract in the vicinity of Clermont, Sergeant Township, McKean County, (1879)
|author=Digital Collections, The New York Public Library |accessdate=April 24, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>