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Manuscripts and Archives Division, The New York Public Library. "Helber, C. Julian" The New York Public Library Digital Collections. 1901. https://old-digitalcollections.nypl.org/items/a17a47f0-4263-0135-4cb6-04beae52ec72
Manuscripts and Archives Division, The New York Public Library. "Helber, C. Julian" New York Public Library Digital Collections. Accessed November 3, 2026. https://old-digitalcollections.nypl.org/items/a17a47f0-4263-0135-4cb6-04beae52ec72
Manuscripts and Archives Division, The New York Public Library. (1901). Helber, C. Julian Retrieved from https://old-digitalcollections.nypl.org/items/a17a47f0-4263-0135-4cb6-04beae52ec72
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/a17a47f0-4263-0135-4cb6-04beae52ec72 | title=
(text)
Helber, C. Julian, (1901)|author=Digital Collections, The New York Public Library |accessdate=November 3, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>