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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Geological map of the district between Keweenaw Bay and Chocolate River, Lake Superior, Michigan " The New York Public Library Digital Collections. 1850 - 1851. https://digitalcollections.nypl.org/items/da6b6730-b5bc-0135-4867-049c584f398a
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Geological map of the district between Keweenaw Bay and Chocolate River, Lake Superior, Michigan " New York Public Library Digital Collections. Accessed January 15, 2025. https://digitalcollections.nypl.org/items/da6b6730-b5bc-0135-4867-049c584f398a
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1850 - 1851). Geological map of the district between Keweenaw Bay and Chocolate River, Lake Superior, Michigan Retrieved from https://digitalcollections.nypl.org/items/da6b6730-b5bc-0135-4867-049c584f398a
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/da6b6730-b5bc-0135-4867-049c584f398a | title=
(cartographic)
Geological map of the district between Keweenaw Bay and Chocolate River, Lake Superior, Michigan , (1850 - 1851)
|author=Digital Collections, The New York Public Library |accessdate=January 15, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>