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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Map showing a portion of the boundaries of Maryland, Pennsylvania, & Delaware : as surveyed in 1849 & '50, under the direction of Lieutenant Colonel J.D. Graham, U.S. Topl. Engineers, at the request of H.G.S. Key, Joshua P. Eyre, & Geo. Read Riddle, commissioners of the respective states" The New York Public Library Digital Collections. 1850. https://digitalcollections.nypl.org/items/510d47da-edfe-a3d9-e040-e00a18064a99
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Map showing a portion of the boundaries of Maryland, Pennsylvania, & Delaware : as surveyed in 1849 & '50, under the direction of Lieutenant Colonel J.D. Graham, U.S. Topl. Engineers, at the request of H.G.S. Key, Joshua P. Eyre, & Geo. Read Riddle, commissioners of the respective states" New York Public Library Digital Collections. Accessed April 23, 2024. https://digitalcollections.nypl.org/items/510d47da-edfe-a3d9-e040-e00a18064a99
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1850). Map showing a portion of the boundaries of Maryland, Pennsylvania, & Delaware : as surveyed in 1849 & '50, under the direction of Lieutenant Colonel J.D. Graham, U.S. Topl. Engineers, at the request of H.G.S. Key, Joshua P. Eyre, & Geo. Read Riddle, commissioners of the respective states Retrieved from https://digitalcollections.nypl.org/items/510d47da-edfe-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47da-edfe-a3d9-e040-e00a18064a99 | title=
(cartographic)
Map showing a portion of the boundaries of Maryland, Pennsylvania, & Delaware : as surveyed in 1849 & '50, under the direction of Lieutenant Colonel J.D. Graham, U.S. Topl. Engineers, at the request of H.G.S. Key, Joshua P. Eyre, & Geo. Read Riddle, commissioners of the respective states, (1850)
|author=Digital Collections, The New York Public Library |accessdate=April 23, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>