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General Research Division, The New York Public Library. "The Roebling residence and factory in Trenton, from a sketch made by Washington A. Roebling in 1857; Charles Swan, for many years an important factor in the Roebling Enterprises" The New York Public Library Digital Collections. 1931. https://digitalcollections.nypl.org/items/ec338470-9fab-0134-1f3d-00505686a51c
General Research Division, The New York Public Library. "The Roebling residence and factory in Trenton, from a sketch made by Washington A. Roebling in 1857; Charles Swan, for many years an important factor in the Roebling Enterprises" New York Public Library Digital Collections. Accessed April 27, 2024. https://digitalcollections.nypl.org/items/ec338470-9fab-0134-1f3d-00505686a51c
General Research Division, The New York Public Library. (1931). The Roebling residence and factory in Trenton, from a sketch made by Washington A. Roebling in 1857; Charles Swan, for many years an important factor in the Roebling Enterprises Retrieved from https://digitalcollections.nypl.org/items/ec338470-9fab-0134-1f3d-00505686a51c
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/ec338470-9fab-0134-1f3d-00505686a51c | title=
(still image)
The Roebling residence and factory in Trenton, from a sketch made by Washington A. Roebling in 1857; Charles Swan, for many years an important factor in the Roebling Enterprises, (1931)
|author=Digital Collections, The New York Public Library |accessdate=April 27, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>