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General Research Division, The New York Public Library. "Machine-Shop: Radial drills ; High-speed grooving machines ; Heavy-duty radial drills ; Drilling tubesheet for a large heat-exchanger." The New York Public Library Digital Collections. 1944. https://digitalcollections.nypl.org/items/510d47dd-ff10-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Machine-Shop: Radial drills ; High-speed grooving machines ; Heavy-duty radial drills ; Drilling tubesheet for a large heat-exchanger." New York Public Library Digital Collections. Accessed April 19, 2024. https://digitalcollections.nypl.org/items/510d47dd-ff10-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1944). Machine-Shop: Radial drills ; High-speed grooving machines ; Heavy-duty radial drills ; Drilling tubesheet for a large heat-exchanger. Retrieved from https://digitalcollections.nypl.org/items/510d47dd-ff10-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47dd-ff10-a3d9-e040-e00a18064a99 | title=
(still image)
Machine-Shop: Radial drills ; High-speed grooving machines ; Heavy-duty radial drills ; Drilling tubesheet for a large heat-exchanger., (1944)
|author=Digital Collections, The New York Public Library |accessdate=April 19, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>