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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. "Haglund, Allen E." The New York Public Library Digital Collections. 1935 - 1945. https://digitalcollections.nypl.org/items/211f8fc0-03fc-013d-0b53-0242ac110002
Manuscripts and Archives Division, The New York Public Library. "Haglund, Allen E." New York Public Library Digital Collections. Accessed February 7, 2025. https://digitalcollections.nypl.org/items/211f8fc0-03fc-013d-0b53-0242ac110002
Manuscripts and Archives Division, The New York Public Library. (1935 - 1945). Haglund, Allen E. Retrieved from https://digitalcollections.nypl.org/items/211f8fc0-03fc-013d-0b53-0242ac110002
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(text)
Haglund, Allen E., (1935 - 1945)|author=Digital Collections, The New York Public Library |accessdate=February 7, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>