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Manuscripts and Archives Division, The New York Public Library. "Helmer, N" The New York Public Library Digital Collections. 1891. https://digitalcollections.nypl.org/items/0348a750-4264-0135-9f49-5d243fe0c4f9
Manuscripts and Archives Division, The New York Public Library. "Helmer, N" New York Public Library Digital Collections. Accessed April 20, 2024. https://digitalcollections.nypl.org/items/0348a750-4264-0135-9f49-5d243fe0c4f9
Manuscripts and Archives Division, The New York Public Library. (1891). Helmer, N Retrieved from https://digitalcollections.nypl.org/items/0348a750-4264-0135-9f49-5d243fe0c4f9
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/0348a750-4264-0135-9f49-5d243fe0c4f9 | title=
(text)
Helmer, N, (1891)|author=Digital Collections, The New York Public Library |accessdate=April 20, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>