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© The New York Public Library, 2026
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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Preliminary map of the western portion of the reconnaissance and survey for a Pacific rail road route near the 35th par." The New York Public Library Digital Collections. 1858. https://old-digitalcollections.nypl.org/items/760ae1c0-2a3a-0136-9b52-6538b070a3d3
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Preliminary map of the western portion of the reconnaissance and survey for a Pacific rail road route near the 35th par." New York Public Library Digital Collections. Accessed October 5, 2026. https://old-digitalcollections.nypl.org/items/760ae1c0-2a3a-0136-9b52-6538b070a3d3
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1858). Preliminary map of the western portion of the reconnaissance and survey for a Pacific rail road route near the 35th par. Retrieved from https://old-digitalcollections.nypl.org/items/760ae1c0-2a3a-0136-9b52-6538b070a3d3
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/760ae1c0-2a3a-0136-9b52-6538b070a3d3 | title=
(cartographic)
Preliminary map of the western portion of the reconnaissance and survey for a Pacific rail road route near the 35th par., (1858)
|author=Digital Collections, The New York Public Library |accessdate=October 5, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>