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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Section and diagram illustrating the geology of the region between the northern shores of Lakes Superior and Michigan" The New York Public Library Digital Collections. 1850 - 1851. https://digitalcollections.nypl.org/items/73cdab90-5dec-0136-03f2-1b8ce212c6b3
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Section and diagram illustrating the geology of the region between the northern shores of Lakes Superior and Michigan" New York Public Library Digital Collections. Accessed January 28, 2025. https://digitalcollections.nypl.org/items/73cdab90-5dec-0136-03f2-1b8ce212c6b3
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1850 - 1851). Section and diagram illustrating the geology of the region between the northern shores of Lakes Superior and Michigan Retrieved from https://digitalcollections.nypl.org/items/73cdab90-5dec-0136-03f2-1b8ce212c6b3
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/73cdab90-5dec-0136-03f2-1b8ce212c6b3 | title=
(cartographic)
Section and diagram illustrating the geology of the region between the northern shores of Lakes Superior and Michigan, (1850 - 1851)
|author=Digital Collections, The New York Public Library |accessdate=January 28, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>