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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Physical lecture room, Institute of Technology, designed and directed by Mr. S. P. Ruggles." The New York Public Library Digital Collections. 1850 - 1930. https://qa-digitalcollections.nypl.org/items/510d47e0-8065-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Physical lecture room, Institute of Technology, designed and directed by Mr. S. P. Ruggles." New York Public Library Digital Collections. Accessed November 25, 2024. https://qa-digitalcollections.nypl.org/items/510d47e0-8065-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1850 - 1930). Physical lecture room, Institute of Technology, designed and directed by Mr. S. P. Ruggles. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47e0-8065-a3d9-e040-e00a18064a99
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(still image)
Physical lecture room, Institute of Technology, designed and directed by Mr. S. P. Ruggles., (1850 - 1930)|author=Digital Collections, The New York Public Library |accessdate=November 25, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>