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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Map illustrating the general geological features of the country west of the Mississippi River" The New York Public Library Digital Collections. 1858. https://old-digitalcollections.nypl.org/items/1f266b70-d7c0-0132-9d1e-58d385a7bbd0
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Map illustrating the general geological features of the country west of the Mississippi River" New York Public Library Digital Collections. Accessed September 16, 2026. https://old-digitalcollections.nypl.org/items/1f266b70-d7c0-0132-9d1e-58d385a7bbd0
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1858). Map illustrating the general geological features of the country west of the Mississippi River Retrieved from https://old-digitalcollections.nypl.org/items/1f266b70-d7c0-0132-9d1e-58d385a7bbd0
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/1f266b70-d7c0-0132-9d1e-58d385a7bbd0 | title=
(cartographic)
Map illustrating the general geological features of the country west of the Mississippi River, (1858)
|author=Digital Collections, The New York Public Library |accessdate=September 16, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>