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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Power house, dam, lock and dry dock, Mississippi River Power Company, Keokuk, Iowa." The New York Public Library Digital Collections. 1860 - 1920. https://digitalcollections.nypl.org/items/510d47d9-b679-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Power house, dam, lock and dry dock, Mississippi River Power Company, Keokuk, Iowa." New York Public Library Digital Collections. Accessed April 20, 2024. https://digitalcollections.nypl.org/items/510d47d9-b679-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1860 - 1920). Power house, dam, lock and dry dock, Mississippi River Power Company, Keokuk, Iowa. Retrieved from https://digitalcollections.nypl.org/items/510d47d9-b679-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47d9-b679-a3d9-e040-e00a18064a99 | title=
(still image)
Power house, dam, lock and dry dock, Mississippi River Power Company, Keokuk, Iowa., (1860 - 1920)
|author=Digital Collections, The New York Public Library |accessdate=April 20, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>