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The New York Public Library is a 501(c)(3) | EIN 13-1887440
John A. Roebling Sons Company Brooklyn Bridge engineer's drawings
Manuscripts and Archives Division, The New York Public Library. "Pendulum Rope" The New York Public Library Digital Collections. 1870. https://qa-digitalcollections.nypl.org/items/97ef1d40-3889-013c-7f9f-0242ac110003
Manuscripts and Archives Division, The New York Public Library. "Pendulum Rope" New York Public Library Digital Collections. Accessed November 22, 2024. https://qa-digitalcollections.nypl.org/items/97ef1d40-3889-013c-7f9f-0242ac110003
Manuscripts and Archives Division, The New York Public Library. (1870). Pendulum Rope Retrieved from https://qa-digitalcollections.nypl.org/items/97ef1d40-3889-013c-7f9f-0242ac110003
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/97ef1d40-3889-013c-7f9f-0242ac110003 | title=
(still image)
Pendulum Rope, (1870)|author=Digital Collections, The New York Public Library |accessdate=November 22, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>