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The New York Public Library is a 501(c)(3) | EIN 13-1887440
Samuel Langhorne Clemens collection of papers, 1856-1938 (bulk 1870-1938)
Henry W. and Albert A. Berg Collection of English and American Literature, The New York Public Library. "Those Extraordinary Twins" The New York Public Library Digital Collections. 1892. https://qa-digitalcollections.nypl.org/items/c8339a50-2a28-0132-22a1-58d385a7b928
Henry W. and Albert A. Berg Collection of English and American Literature, The New York Public Library. "Those Extraordinary Twins" New York Public Library Digital Collections. Accessed November 23, 2024. https://qa-digitalcollections.nypl.org/items/c8339a50-2a28-0132-22a1-58d385a7b928
Henry W. and Albert A. Berg Collection of English and American Literature, The New York Public Library. (1892). Those Extraordinary Twins Retrieved from https://qa-digitalcollections.nypl.org/items/c8339a50-2a28-0132-22a1-58d385a7b928
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/c8339a50-2a28-0132-22a1-58d385a7b928 | title=
(text)
Those Extraordinary Twins, (1892)|author=Digital Collections, The New York Public Library |accessdate=November 23, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>