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Irma and Paul Milstein Division of United States History, Local History and Genealogy, The New York Public Library. "The Willoughby Buildings" The New York Public Library Digital Collections. 1900 - 1945. https://old-digitalcollections.nypl.org/items/c90db310-c1d9-0132-7ae1-58d385a7bbd0
Irma and Paul Milstein Division of United States History, Local History and Genealogy, The New York Public Library. "The Willoughby Buildings" New York Public Library Digital Collections. Accessed October 8, 2026. https://old-digitalcollections.nypl.org/items/c90db310-c1d9-0132-7ae1-58d385a7bbd0
Irma and Paul Milstein Division of United States History, Local History and Genealogy, The New York Public Library. (1900 - 1945). The Willoughby Buildings Retrieved from https://old-digitalcollections.nypl.org/items/c90db310-c1d9-0132-7ae1-58d385a7bbd0
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(still image)
The Willoughby Buildings, (1900 - 1945)|author=Digital Collections, The New York Public Library |accessdate=October 8, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>