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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Map of the survey of a route for the Pacific Railroad near the 32d parallel between the Rio Grande & Red River" The New York Public Library Digital Collections. 1857. https://digitalcollections.nypl.org/items/77253940-bc64-0133-5c27-00505686a51c
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Map of the survey of a route for the Pacific Railroad near the 32d parallel between the Rio Grande & Red River" New York Public Library Digital Collections. Accessed January 28, 2025. https://digitalcollections.nypl.org/items/77253940-bc64-0133-5c27-00505686a51c
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1857). Map of the survey of a route for the Pacific Railroad near the 32d parallel between the Rio Grande & Red River Retrieved from https://digitalcollections.nypl.org/items/77253940-bc64-0133-5c27-00505686a51c
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/77253940-bc64-0133-5c27-00505686a51c | title=
(cartographic)
Map of the survey of a route for the Pacific Railroad near the 32d parallel between the Rio Grande & Red River, (1857)
|author=Digital Collections, The New York Public Library |accessdate=January 28, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>