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Manuscripts and Archives Division, The New York Public Library. "Ritterhouse, Paul" The New York Public Library Digital Collections. 1914. https://qa-digitalcollections.nypl.org/items/1c6a9a00-dd1d-0135-70c8-2f588fa063ab
Manuscripts and Archives Division, The New York Public Library. "Ritterhouse, Paul" New York Public Library Digital Collections. Accessed December 22, 2024. https://qa-digitalcollections.nypl.org/items/1c6a9a00-dd1d-0135-70c8-2f588fa063ab
Manuscripts and Archives Division, The New York Public Library. (1914). Ritterhouse, Paul Retrieved from https://qa-digitalcollections.nypl.org/items/1c6a9a00-dd1d-0135-70c8-2f588fa063ab
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Ritterhouse, Paul, (1914)|author=Digital Collections, The New York Public Library |accessdate=December 22, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>