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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Geological map of Keweenaw Point, Lake Superior, Michigan " The New York Public Library Digital Collections. 1849. http://digital.gallery.nypl.org/items/8fd8fc80-bcec-0135-d835-11d82e53b5fe
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Geological map of Keweenaw Point, Lake Superior, Michigan " New York Public Library Digital Collections. Accessed December 7, 2019. http://digital.gallery.nypl.org/items/8fd8fc80-bcec-0135-d835-11d82e53b5fe
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1849). Geological map of Keweenaw Point, Lake Superior, Michigan Retrieved from http://digital.gallery.nypl.org/items/8fd8fc80-bcec-0135-d835-11d82e53b5fe
<ref name=NYPL>{{cite web | url=http://digital.gallery.nypl.org/items/8fd8fc80-bcec-0135-d835-11d82e53b5fe | title=
(cartographic)
Geological map of Keweenaw Point, Lake Superior, Michigan , (1849)
}}
|author=Digital Collections, The New York Public Library |accessdate=December 7, 2019 |publisher=The New York Public Library, Astor, Lennox, and Tilden Foundation}}</ref>