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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Geological map of the Lake Superior land district in the state of Michigan " The New York Public Library Digital Collections. 1850 - 1851. https://digitalcollections.nypl.org/items/604a1b10-5d3b-0136-302c-79eb507a8e5b
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Geological map of the Lake Superior land district in the state of Michigan " New York Public Library Digital Collections. Accessed January 15, 2025. https://digitalcollections.nypl.org/items/604a1b10-5d3b-0136-302c-79eb507a8e5b
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1850 - 1851). Geological map of the Lake Superior land district in the state of Michigan Retrieved from https://digitalcollections.nypl.org/items/604a1b10-5d3b-0136-302c-79eb507a8e5b
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/604a1b10-5d3b-0136-302c-79eb507a8e5b | title=
(cartographic)
Geological map of the Lake Superior land district in the state of 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>