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Irma and Paul Milstein Division of United States History, Local History and Genealogy, The New York Public Library. "The loop on Berthouds Pass, Crossing the Continental Divide, near the Denver Mountain Parks" The New York Public Library Digital Collections. 1862 - 1963. https://qa-digitalcollections.nypl.org/items/510d47e4-0306-a3d9-e040-e00a18064a99
Irma and Paul Milstein Division of United States History, Local History and Genealogy, The New York Public Library. "The loop on Berthouds Pass, Crossing the Continental Divide, near the Denver Mountain Parks" New York Public Library Digital Collections. Accessed November 30, 2024. https://qa-digitalcollections.nypl.org/items/510d47e4-0306-a3d9-e040-e00a18064a99
Irma and Paul Milstein Division of United States History, Local History and Genealogy, The New York Public Library. (1862 - 1963). The loop on Berthouds Pass, Crossing the Continental Divide, near the Denver Mountain Parks Retrieved from https://qa-digitalcollections.nypl.org/items/510d47e4-0306-a3d9-e040-e00a18064a99
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(still image)
The loop on Berthouds Pass, Crossing the Continental Divide, near the Denver Mountain Parks, (1862 - 1963)|author=Digital Collections, The New York Public Library |accessdate=November 30, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>