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Manuscripts and Archives Division, The New York Public Library. "Helm, Joseph C" The New York Public Library Digital Collections. 1892. https://digitalcollections.nypl.org/items/e309ac40-7ee0-0136-6211-0bc934c11de5
Manuscripts and Archives Division, The New York Public Library. "Helm, Joseph C" New York Public Library Digital Collections. Accessed April 24, 2024. https://digitalcollections.nypl.org/items/e309ac40-7ee0-0136-6211-0bc934c11de5
Manuscripts and Archives Division, The New York Public Library. (1892). Helm, Joseph C Retrieved from https://digitalcollections.nypl.org/items/e309ac40-7ee0-0136-6211-0bc934c11de5
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/e309ac40-7ee0-0136-6211-0bc934c11de5 | title=
(text)
Helm, Joseph C, (1892)|author=Digital Collections, The New York Public Library |accessdate=April 24, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>