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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "A series of columnar sections constructed from surface observations and the records of eleven oil wells situated between Bradford in McKean County and Ridgway in Elk County showing the relation of the lower caboniferous coal beds to the Bradford oil producing sand and the thickening of the sub conglomerate rocks" The New York Public Library Digital Collections. 1879. https://qa-digitalcollections.nypl.org/items/f6615470-292c-0135-94ea-4b4d2ef64915
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "A series of columnar sections constructed from surface observations and the records of eleven oil wells situated between Bradford in McKean County and Ridgway in Elk County showing the relation of the lower caboniferous coal beds to the Bradford oil producing sand and the thickening of the sub conglomerate rocks" New York Public Library Digital Collections. Accessed November 25, 2024. https://qa-digitalcollections.nypl.org/items/f6615470-292c-0135-94ea-4b4d2ef64915
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1879). A series of columnar sections constructed from surface observations and the records of eleven oil wells situated between Bradford in McKean County and Ridgway in Elk County showing the relation of the lower caboniferous coal beds to the Bradford oil producing sand and the thickening of the sub conglomerate rocks Retrieved from https://qa-digitalcollections.nypl.org/items/f6615470-292c-0135-94ea-4b4d2ef64915
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/f6615470-292c-0135-94ea-4b4d2ef64915 | title=
(cartographic)
A series of columnar sections constructed from surface observations and the records of eleven oil wells situated between Bradford in McKean County and Ridgway in Elk County showing the relation of the lower caboniferous coal beds to the Bradford oil producing sand and the thickening of the sub conglomerate rocks, (1879)
|author=Digital Collections, The New York Public Library |accessdate=November 25, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>