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Irma and Paul Milstein Division of United States History, Local History and Genealogy, The New York Public Library. "Vanderbilt house at northeast corner of Fifth Avenue and Fifty-first Street, the last of the "twin houses" which for many years blocked the northward movement of trade on the avenue" The New York Public Library Digital Collections. 1934. https://old-digitalcollections.nypl.org/items/d9d8f920-edae-0131-dd17-58d385a7bbd0
Irma and Paul Milstein Division of United States History, Local History and Genealogy, The New York Public Library. "Vanderbilt house at northeast corner of Fifth Avenue and Fifty-first Street, the last of the "twin houses" which for many years blocked the northward movement of trade on the avenue" New York Public Library Digital Collections. Accessed October 1, 2026. https://old-digitalcollections.nypl.org/items/d9d8f920-edae-0131-dd17-58d385a7bbd0
Irma and Paul Milstein Division of United States History, Local History and Genealogy, The New York Public Library. (1934). Vanderbilt house at northeast corner of Fifth Avenue and Fifty-first Street, the last of the "twin houses" which for many years blocked the northward movement of trade on the avenue Retrieved from https://old-digitalcollections.nypl.org/items/d9d8f920-edae-0131-dd17-58d385a7bbd0
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/d9d8f920-edae-0131-dd17-58d385a7bbd0 | title=
(still image)
Vanderbilt house at northeast corner of Fifth Avenue and Fifty-first Street, the last of the "twin houses" which for many years blocked the northward movement of trade on the avenue, (1934)|author=Digital Collections, The New York Public Library |accessdate=October 1, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>