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Manuscripts and Archives Division, The New York Public Library. "Duncan, William Butler" The New York Public Library Digital Collections. 1861 - 1874. https://digitalcollections.nypl.org/items/a42fae1e-cc00-6893-e040-e00a18067340
Manuscripts and Archives Division, The New York Public Library. "Duncan, William Butler" New York Public Library Digital Collections. Accessed April 20, 2024. https://digitalcollections.nypl.org/items/a42fae1e-cc00-6893-e040-e00a18067340
Manuscripts and Archives Division, The New York Public Library. (1861 - 1874). Duncan, William Butler Retrieved from https://digitalcollections.nypl.org/items/a42fae1e-cc00-6893-e040-e00a18067340
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(text)
Duncan, William Butler, (1861 - 1874)|author=Digital Collections, The New York Public Library |accessdate=April 20, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>