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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Geological map of the environs of Orbisonia at Rockhill Gap, Huntingdon County " The New York Public Library Digital Collections. 1878. https://digitalcollections.nypl.org/items/22113ae0-fb98-0134-04f8-1116bbcf3b5a
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Geological map of the environs of Orbisonia at Rockhill Gap, Huntingdon County " New York Public Library Digital Collections. Accessed January 25, 2021. https://digitalcollections.nypl.org/items/22113ae0-fb98-0134-04f8-1116bbcf3b5a
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1878). Geological map of the environs of Orbisonia at Rockhill Gap, Huntingdon County Retrieved from https://digitalcollections.nypl.org/items/22113ae0-fb98-0134-04f8-1116bbcf3b5a
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/22113ae0-fb98-0134-04f8-1116bbcf3b5a | title=
(cartographic)
Geological map of the environs of Orbisonia at Rockhill Gap, Huntingdon County , (1878)
|author=Digital Collections, The New York Public Library |accessdate=January 25, 2021 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>