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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Geological section from the mouth of Rock River through the Blue Mounds to the Wisconsin River " The New York Public Library Digital Collections. 1844. https://digitalcollections.nypl.org/items/150212a0-94b2-0135-9d36-65cfa566109a
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Geological section from the mouth of Rock River through the Blue Mounds to the Wisconsin River " New York Public Library Digital Collections. Accessed April 23, 2024. https://digitalcollections.nypl.org/items/150212a0-94b2-0135-9d36-65cfa566109a
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1844). Geological section from the mouth of Rock River through the Blue Mounds to the Wisconsin River Retrieved from https://digitalcollections.nypl.org/items/150212a0-94b2-0135-9d36-65cfa566109a
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/150212a0-94b2-0135-9d36-65cfa566109a | title=
(cartographic)
Geological section from the mouth of Rock River through the Blue Mounds to the Wisconsin River , (1844)
|author=Digital Collections, The New York Public Library |accessdate=April 23, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>