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Irma and Paul Milstein Division of United States History, Local History and Genealogy, The New York Public Library. "The Keystone, northeast corner of Broadway and One hundred and forty-fifth Street; Plan of first floor; Plan of upper floors." The New York Public Library Digital Collections. 1908. https://qa-digitalcollections.nypl.org/items/510d47db-9ed8-a3d9-e040-e00a18064a99
Irma and Paul Milstein Division of United States History, Local History and Genealogy, The New York Public Library. "The Keystone, northeast corner of Broadway and One hundred and forty-fifth Street; Plan of first floor; Plan of upper floors." New York Public Library Digital Collections. Accessed November 23, 2024. https://qa-digitalcollections.nypl.org/items/510d47db-9ed8-a3d9-e040-e00a18064a99
Irma and Paul Milstein Division of United States History, Local History and Genealogy, The New York Public Library. (1908). The Keystone, northeast corner of Broadway and One hundred and forty-fifth Street; Plan of first floor; Plan of upper floors. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47db-9ed8-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47db-9ed8-a3d9-e040-e00a18064a99 | title=
(text)
The Keystone, northeast corner of Broadway and One hundred and forty-fifth Street; Plan of first floor; Plan of upper floors., (1908)
|author=Digital Collections, The New York Public Library |accessdate=November 23, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>