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© The New York Public Library, 2025
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Photographic views of the construction of the New York City subway system, 1901-1905
Irma and Paul Milstein Division of United States History, Local History and Genealogy, The New York Public Library. "Digging Beneath New York City" The New York Public Library Digital Collections. 1901 - 1905. https://digitalcollections.nypl.org/items/a44288b4-9bd7-b31f-e040-e00a18060314
Irma and Paul Milstein Division of United States History, Local History and Genealogy, The New York Public Library. "Digging Beneath New York City" New York Public Library Digital Collections. Accessed January 16, 2025. https://digitalcollections.nypl.org/items/a44288b4-9bd7-b31f-e040-e00a18060314
Irma and Paul Milstein Division of United States History, Local History and Genealogy, The New York Public Library. (1901 - 1905). Digging Beneath New York City Retrieved from https://digitalcollections.nypl.org/items/a44288b4-9bd7-b31f-e040-e00a18060314
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/a44288b4-9bd7-b31f-e040-e00a18060314 | title=
(still image)
Digging Beneath New York City, (1901 - 1905)|author=Digital Collections, The New York Public Library |accessdate=January 16, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>