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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Geological map of Isle Royale, Lake Superior, Michigan " The New York Public Library Digital Collections. 1849. https://digitalcollections.nypl.org/items/277a2130-b820-0135-c0f2-75a142df2bd1
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Geological map of Isle Royale, Lake Superior, Michigan " New York Public Library Digital Collections. Accessed September 8, 2024. https://digitalcollections.nypl.org/items/277a2130-b820-0135-c0f2-75a142df2bd1
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1849). Geological map of Isle Royale, Lake Superior, Michigan Retrieved from https://digitalcollections.nypl.org/items/277a2130-b820-0135-c0f2-75a142df2bd1
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/277a2130-b820-0135-c0f2-75a142df2bd1 | title=
(cartographic)
Geological map of Isle Royale, Lake Superior, Michigan , (1849)
|author=Digital Collections, The New York Public Library |accessdate=September 8, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>