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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Johnson hydraulic penstock valve to be installed with the 55,000 H.P. Queenston turbine, erected in shop." The New York Public Library Digital Collections. 1860 - 1920. https://digitalcollections.nypl.org/items/510d47d9-b4ea-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Johnson hydraulic penstock valve to be installed with the 55,000 H.P. Queenston turbine, erected in shop." New York Public Library Digital Collections. Accessed May 17, 2022. https://digitalcollections.nypl.org/items/510d47d9-b4ea-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1860 - 1920). Johnson hydraulic penstock valve to be installed with the 55,000 H.P. Queenston turbine, erected in shop. Retrieved from https://digitalcollections.nypl.org/items/510d47d9-b4ea-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47d9-b4ea-a3d9-e040-e00a18064a99 | title=
(still image)
Johnson hydraulic penstock valve to be installed with the 55,000 H.P. Queenston turbine, erected in shop., (1860 - 1920)
|author=Digital Collections, The New York Public Library |accessdate=May 17, 2022 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>