This primary source comes from the Records of the Public Housing Administration.
National Archives Identifier:
535468Full Citation: Airshaft of a dumbbell tenement, New York City, taken from the roof; ca. 1900; Records of the Public Housing Administration, Record Group 196. [Online Version, https://docsteach.org/documents/document/airshaft-of-a-dumbbell-tenement-new-york-city-taken-from-the-roof, April 20, 2024]