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Irma and Paul Milstein Division of United States History, Local History and Genealogy, The New York Public Library. "A section of one of the great steel inverted siphons, 11 feet in diameter with steel 1/4" to 1/2" in thickness" The New York Public Library Digital Collections. 1913-07. https://digitalcollections.nypl.org/items/510d47e4-75e2-a3d9-e040-e00a18064a99
Irma and Paul Milstein Division of United States History, Local History and Genealogy, The New York Public Library. "A section of one of the great steel inverted siphons, 11 feet in diameter with steel 1/4" to 1/2" in thickness" New York Public Library Digital Collections. Accessed April 17, 2025. https://digitalcollections.nypl.org/items/510d47e4-75e2-a3d9-e040-e00a18064a99
Irma and Paul Milstein Division of United States History, Local History and Genealogy, The New York Public Library. (1913-07). A section of one of the great steel inverted siphons, 11 feet in diameter with steel 1/4" to 1/2" in thickness Retrieved from https://digitalcollections.nypl.org/items/510d47e4-75e2-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47e4-75e2-a3d9-e040-e00a18064a99 | title=
(still image)
A section of one of the great steel inverted siphons, 11 feet in diameter with steel 1/4" to 1/2" in thickness, (1913-07)
|author=Digital Collections, The New York Public Library |accessdate=April 17, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>