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Manuscripts and Archives Division, The New York Public Library. "Ritzmann, Charles L" The New York Public Library Digital Collections. 1917. https://old-digitalcollections.nypl.org/items/5a1593c0-dd1d-0135-e0f1-0d16aeae5072
Manuscripts and Archives Division, The New York Public Library. "Ritzmann, Charles L" New York Public Library Digital Collections. Accessed October 7, 2026. https://old-digitalcollections.nypl.org/items/5a1593c0-dd1d-0135-e0f1-0d16aeae5072
Manuscripts and Archives Division, The New York Public Library. (1917). Ritzmann, Charles L Retrieved from https://old-digitalcollections.nypl.org/items/5a1593c0-dd1d-0135-e0f1-0d16aeae5072
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