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Manuscripts and Archives Division, The New York Public Library. "Envelope addressed to Geo. L. Duyckinck stamped March 28th" The New York Public Library Digital Collections. 1843 - 1873. https://digitalcollections.nypl.org/items/8b250d10-2731-0133-e598-58d385a7bbd0
Manuscripts and Archives Division, The New York Public Library. "Envelope addressed to Geo. L. Duyckinck stamped March 28th" New York Public Library Digital Collections. Accessed January 28, 2025. https://digitalcollections.nypl.org/items/8b250d10-2731-0133-e598-58d385a7bbd0
Manuscripts and Archives Division, The New York Public Library. (1843 - 1873). Envelope addressed to Geo. L. Duyckinck stamped March 28th Retrieved from https://digitalcollections.nypl.org/items/8b250d10-2731-0133-e598-58d385a7bbd0
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/8b250d10-2731-0133-e598-58d385a7bbd0 | title=
(text)
Envelope addressed to Geo. L. Duyckinck stamped March 28th, (1843 - 1873)|author=Digital Collections, The New York Public Library |accessdate=January 28, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>