Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "A map of Pennsylvania exhibiting not only the improved parts of that Province, but also its extensive frontiers : laid down from actual surveys and chiefly from the late map of W. Scull published in 1770 : and humbly inscribed to the Honourable Thomas Penn and Richard Penn, esquires, true and absolute proprietaries & governors of the province of Pennsylvania and the territories thereunto belonging." The New York Public Library Digital Collections. 1775-06-10. http://digitalcollections.nypl.org/items/510d47da-efab-a3d9-e040-e00a18064a99
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "A map of Pennsylvania exhibiting not only the improved parts of that Province, but also its extensive frontiers : laid down from actual surveys and chiefly from the late map of W. Scull published in 1770 : and humbly inscribed to the Honourable Thomas Penn and Richard Penn, esquires, true and absolute proprietaries & governors of the province of Pennsylvania and the territories thereunto belonging." New York Public Library Digital Collections. Accessed April 22, 2019. http://digitalcollections.nypl.org/items/510d47da-efab-a3d9-e040-e00a18064a99
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1775-06-10). A map of Pennsylvania exhibiting not only the improved parts of that Province, but also its extensive frontiers : laid down from actual surveys and chiefly from the late map of W. Scull published in 1770 : and humbly inscribed to the Honourable Thomas Penn and Richard Penn, esquires, true and absolute proprietaries & governors of the province of Pennsylvania and the territories thereunto belonging. Retrieved from http://digitalcollections.nypl.org/items/510d47da-efab-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=http://digitalcollections.nypl.org/items/510d47da-efab-a3d9-e040-e00a18064a99 | title=
(still image)
A map of Pennsylvania exhibiting not only the improved parts of that Province, but also its extensive frontiers : laid down from actual surveys and chiefly from the late map of W. Scull published in 1770 : and humbly inscribed to the Honourable Thomas Penn and Richard Penn, esquires, true and absolute proprietaries & governors of the province of Pennsylvania and the territories thereunto belonging., (1775-06-10)
}}
|author=Digital Collections, The New York Public Library |accessdate=April 22, 2019 |publisher=The New York Public Library, Astor, Lennox, and Tilden Foundation}}</ref>
![Map of the hydrographical basin of the upper Mississippi River [bottom left].](https://images.nypl.org/index.php?id=ps_map_cd4_47&t=b)
