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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Topographical map of the northern section of the bituminous coal fields in Allegany Co., Maryland : with the lands of the Maryland Mining Company and the routes of communication with Cumberland" The New York Public Library Digital Collections. 1844-09. http://digitalcollections.nypl.org/items/510d47da-ef8f-a3d9-e040-e00a18064a99
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Topographical map of the northern section of the bituminous coal fields in Allegany Co., Maryland : with the lands of the Maryland Mining Company and the routes of communication with Cumberland" New York Public Library Digital Collections. Accessed August 18, 2017. http://digitalcollections.nypl.org/items/510d47da-ef8f-a3d9-e040-e00a18064a99
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1844-09). Topographical map of the northern section of the bituminous coal fields in Allegany Co., Maryland : with the lands of the Maryland Mining Company and the routes of communication with Cumberland Retrieved from http://digitalcollections.nypl.org/items/510d47da-ef8f-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=http://digitalcollections.nypl.org/items/510d47da-ef8f-a3d9-e040-e00a18064a99 | title=
(still image)
Topographical map of the northern section of the bituminous coal fields in Allegany Co., Maryland : with the lands of the Maryland Mining Company and the routes of communication with Cumberland, (1844-09)
}}
|author=Digital Collections, The New York Public Library |accessdate=August 18, 2017 |publisher=The New York Public Library, Astor, Lennox, and Tilden Foundation}}</ref>
