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Manuscripts and Archives Division, The New York Public Library. "Hay, Charles E" The New York Public Library Digital Collections. 1907. https://digitalcollections.nypl.org/items/fbe84ca0-3e57-0135-92a9-255fa9ad6a68
Manuscripts and Archives Division, The New York Public Library. "Hay, Charles E" New York Public Library Digital Collections. Accessed February 5, 2025. https://digitalcollections.nypl.org/items/fbe84ca0-3e57-0135-92a9-255fa9ad6a68
Manuscripts and Archives Division, The New York Public Library. (1907). Hay, Charles E Retrieved from https://digitalcollections.nypl.org/items/fbe84ca0-3e57-0135-92a9-255fa9ad6a68
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/fbe84ca0-3e57-0135-92a9-255fa9ad6a68 | title=
(text)
Hay, Charles E, (1907)|author=Digital Collections, The New York Public Library |accessdate=February 5, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>