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Manuscripts and Archives Division, The New York Public Library. "Derby, Nelson L. - Sanitation" The New York Public Library Digital Collections. 1870 - 1900. https://qa-digitalcollections.nypl.org/items/2f567d20-98d3-0136-eeb5-572794c4ab27
Manuscripts and Archives Division, The New York Public Library. "Derby, Nelson L. - Sanitation" New York Public Library Digital Collections. Accessed December 12, 2024. https://qa-digitalcollections.nypl.org/items/2f567d20-98d3-0136-eeb5-572794c4ab27
Manuscripts and Archives Division, The New York Public Library. (1870 - 1900). Derby, Nelson L. - Sanitation Retrieved from https://qa-digitalcollections.nypl.org/items/2f567d20-98d3-0136-eeb5-572794c4ab27
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Derby, Nelson L. - Sanitation, (1870 - 1900)|author=Digital Collections, The New York Public Library |accessdate=December 12, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>