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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "P. R. R. shops, Altoona, Pa. Wheel-foundry." The New York Public Library Digital Collections. 1850 - 1930. https://digitalcollections.nypl.org/items/02c5fe40-c565-012f-edec-58d385a7bc34
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "P. R. R. shops, Altoona, Pa. Wheel-foundry." New York Public Library Digital Collections. Accessed April 19, 2024. https://digitalcollections.nypl.org/items/02c5fe40-c565-012f-edec-58d385a7bc34
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1850 - 1930). P. R. R. shops, Altoona, Pa. Wheel-foundry. Retrieved from https://digitalcollections.nypl.org/items/02c5fe40-c565-012f-edec-58d385a7bc34
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/02c5fe40-c565-012f-edec-58d385a7bc34 | title=
(still image)
P. R. R. shops, Altoona, Pa. Wheel-foundry., (1850 - 1930)|author=Digital Collections, The New York Public Library |accessdate=April 19, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>