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Manuscripts and Archives Division, The New York Public Library. "O'Callaghan, Edmund Bailey (1797-1880)" The New York Public Library Digital Collections. 1861 - 1868. https://qa-digitalcollections.nypl.org/items/21f6ace0-a8d6-0133-d479-00505686a51c
Manuscripts and Archives Division, The New York Public Library. "O'Callaghan, Edmund Bailey (1797-1880)" New York Public Library Digital Collections. Accessed January 7, 2025. https://qa-digitalcollections.nypl.org/items/21f6ace0-a8d6-0133-d479-00505686a51c
Manuscripts and Archives Division, The New York Public Library. (1861 - 1868). O'Callaghan, Edmund Bailey (1797-1880) Retrieved from https://qa-digitalcollections.nypl.org/items/21f6ace0-a8d6-0133-d479-00505686a51c
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/21f6ace0-a8d6-0133-d479-00505686a51c | title=
(text)
O'Callaghan, Edmund Bailey (1797-1880), (1861 - 1868)|author=Digital Collections, The New York Public Library |accessdate=January 7, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>