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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Geological map of the district between Portage Lake and Montreal River, Lake Superior, Michigan " The New York Public Library Digital Collections. 1849. https://qa-digitalcollections.nypl.org/items/0604fa00-b5be-0135-52a3-0b32fb707867
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Geological map of the district between Portage Lake and Montreal River, Lake Superior, Michigan " New York Public Library Digital Collections. Accessed November 22, 2024. https://qa-digitalcollections.nypl.org/items/0604fa00-b5be-0135-52a3-0b32fb707867
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1849). Geological map of the district between Portage Lake and Montreal River, Lake Superior, Michigan Retrieved from https://qa-digitalcollections.nypl.org/items/0604fa00-b5be-0135-52a3-0b32fb707867
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/0604fa00-b5be-0135-52a3-0b32fb707867 | title=
(cartographic)
Geological map of the district between Portage Lake and Montreal River, Lake Superior, Michigan , (1849)
|author=Digital Collections, The New York Public Library |accessdate=November 22, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>