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New York World's Fair 1939 and 1940 Incorporated records: Central files index
Manuscripts and Archives Division, The New York Public Library. "Hart Advertising Company (Service)" The New York Public Library Digital Collections. 1935 - 1945. https://qa-digitalcollections.nypl.org/items/b619bd98-0f3a-e6d9-e040-e00a1806748c
Manuscripts and Archives Division, The New York Public Library. "Hart Advertising Company (Service)" New York Public Library Digital Collections. Accessed November 25, 2024. https://qa-digitalcollections.nypl.org/items/b619bd98-0f3a-e6d9-e040-e00a1806748c
Manuscripts and Archives Division, The New York Public Library. (1935 - 1945). Hart Advertising Company (Service) Retrieved from https://qa-digitalcollections.nypl.org/items/b619bd98-0f3a-e6d9-e040-e00a1806748c
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/b619bd98-0f3a-e6d9-e040-e00a1806748c | title=
(text)
Hart Advertising Company (Service), (1935 - 1945)|author=Digital Collections, The New York Public Library |accessdate=November 25, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>