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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Famous Horseshoe Curve among Allegheny Mts. (2,571 ft. long, 1,200 ft. across ...)." The New York Public Library Digital Collections. 1908. https://qa-digitalcollections.nypl.org/items/510d47e0-a106-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Famous Horseshoe Curve among Allegheny Mts. (2,571 ft. long, 1,200 ft. across ...)." New York Public Library Digital Collections. Accessed December 5, 2024. https://qa-digitalcollections.nypl.org/items/510d47e0-a106-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1908). Famous Horseshoe Curve among Allegheny Mts. (2,571 ft. long, 1,200 ft. across ...). Retrieved from https://qa-digitalcollections.nypl.org/items/510d47e0-a106-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47e0-a106-a3d9-e040-e00a18064a99 | title=
(still image)
Famous Horseshoe Curve among Allegheny Mts. (2,571 ft. long, 1,200 ft. across ...)., (1908)
|author=Digital Collections, The New York Public Library |accessdate=December 5, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>