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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Two 10000 KW. and three 7500 KW. 25 cycle 11000 volt generators and two 400 KW. 250 volt exciters, Pennsylvania Water and Power Company, McCall Ferry, PA." The New York Public Library Digital Collections. 1860 - 1920. https://qa-digitalcollections.nypl.org/items/510d47d9-b4e8-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Two 10000 KW. and three 7500 KW. 25 cycle 11000 volt generators and two 400 KW. 250 volt exciters, Pennsylvania Water and Power Company, McCall Ferry, PA." New York Public Library Digital Collections. Accessed November 22, 2024. https://qa-digitalcollections.nypl.org/items/510d47d9-b4e8-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1860 - 1920). Two 10000 KW. and three 7500 KW. 25 cycle 11000 volt generators and two 400 KW. 250 volt exciters, Pennsylvania Water and Power Company, McCall Ferry, PA. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47d9-b4e8-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47d9-b4e8-a3d9-e040-e00a18064a99 | title=
(still image)
Two 10000 KW. and three 7500 KW. 25 cycle 11000 volt generators and two 400 KW. 250 volt exciters, Pennsylvania Water and Power Company, McCall Ferry, PA., (1860 - 1920)
|author=Digital Collections, The New York Public Library |accessdate=November 22, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>