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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Map of the hydrographical basin of the upper Mississippi River" The New York Public Library Digital Collections. 1842. https://digitalcollections.nypl.org/items/97ef5c48-74b8-86ed-e040-e00a18067756
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Map of the hydrographical basin of the upper Mississippi River" New York Public Library Digital Collections. Accessed April 24, 2024. https://digitalcollections.nypl.org/items/97ef5c48-74b8-86ed-e040-e00a18067756
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1842). Map of the hydrographical basin of the upper Mississippi River Retrieved from https://digitalcollections.nypl.org/items/97ef5c48-74b8-86ed-e040-e00a18067756
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/97ef5c48-74b8-86ed-e040-e00a18067756 | title=
(cartographic)
Map of the hydrographical basin of the upper Mississippi River, (1842)
|author=Digital Collections, The New York Public Library |accessdate=April 24, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>