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Manuscripts and Archives Division, The New York Public Library. "Hardenbergh, H.J" The New York Public Library Digital Collections. 1902. https://digitalcollections.nypl.org/items/6bf223c0-2d0f-0135-05c8-0d9d265819c2
Manuscripts and Archives Division, The New York Public Library. "Hardenbergh, H.J" New York Public Library Digital Collections. Accessed February 11, 2025. https://digitalcollections.nypl.org/items/6bf223c0-2d0f-0135-05c8-0d9d265819c2
Manuscripts and Archives Division, The New York Public Library. (1902). Hardenbergh, H.J Retrieved from https://digitalcollections.nypl.org/items/6bf223c0-2d0f-0135-05c8-0d9d265819c2
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