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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. "Haftenkamp, J.P. (Vice-Pres. Rochester Gas & Electric Corp.)" The New York Public Library Digital Collections. 1935 - 1945. https://digitalcollections.nypl.org/items/182d6cc0-03fc-013d-3c46-0242ac110002
Manuscripts and Archives Division, The New York Public Library. "Haftenkamp, J.P. (Vice-Pres. Rochester Gas & Electric Corp.)" New York Public Library Digital Collections. Accessed January 16, 2025. https://digitalcollections.nypl.org/items/182d6cc0-03fc-013d-3c46-0242ac110002
Manuscripts and Archives Division, The New York Public Library. (1935 - 1945). Haftenkamp, J.P. (Vice-Pres. Rochester Gas & Electric Corp.) Retrieved from https://digitalcollections.nypl.org/items/182d6cc0-03fc-013d-3c46-0242ac110002
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/182d6cc0-03fc-013d-3c46-0242ac110002 | title=
(text)
Haftenkamp, J.P. (Vice-Pres. Rochester Gas & Electric Corp.), (1935 - 1945)|author=Digital Collections, The New York Public Library |accessdate=January 16, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>