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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. "Hahn, C.A. (Chief Engineer)" The New York Public Library Digital Collections. 1935 - 1945. https://digitalcollections.nypl.org/items/2459dee0-03fc-013d-da0d-0242ac110002
Manuscripts and Archives Division, The New York Public Library. "Hahn, C.A. (Chief Engineer)" New York Public Library Digital Collections. Accessed December 6, 2024. https://digitalcollections.nypl.org/items/2459dee0-03fc-013d-da0d-0242ac110002
Manuscripts and Archives Division, The New York Public Library. (1935 - 1945). Hahn, C.A. (Chief Engineer) Retrieved from https://digitalcollections.nypl.org/items/2459dee0-03fc-013d-da0d-0242ac110002
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Hahn, C.A. (Chief Engineer), (1935 - 1945)|author=Digital Collections, The New York Public Library |accessdate=December 6, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>