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Manuscripts and Archives Division, The New York Public Library. "Mr. Wm. Allen Butler calling card addressed to "Dear Duyckinck"" The New York Public Library Digital Collections. 1843 - 1873. https://digitalcollections.nypl.org/items/7f5bbd30-2746-0133-3019-58d385a7bbd0
Manuscripts and Archives Division, The New York Public Library. "Mr. Wm. Allen Butler calling card addressed to "Dear Duyckinck"" New York Public Library Digital Collections. Accessed July 9, 2025. https://digitalcollections.nypl.org/items/7f5bbd30-2746-0133-3019-58d385a7bbd0
Manuscripts and Archives Division, The New York Public Library. (1843 - 1873). Mr. Wm. Allen Butler calling card addressed to "Dear Duyckinck" Retrieved from https://digitalcollections.nypl.org/items/7f5bbd30-2746-0133-3019-58d385a7bbd0
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Mr. Wm. Allen Butler calling card addressed to "Dear Duyckinck", (1843 - 1873)|author=Digital Collections, The New York Public Library |accessdate=July 9, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>