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Manuscripts and Archives Division, The New York Public Library. "Riker, Douglas Hudson" The New York Public Library Digital Collections. 1907. https://digitalcollections.nypl.org/items/05ba1d20-dd1a-0135-d77f-012c28b58ada
Manuscripts and Archives Division, The New York Public Library. "Riker, Douglas Hudson" New York Public Library Digital Collections. Accessed February 11, 2025. https://digitalcollections.nypl.org/items/05ba1d20-dd1a-0135-d77f-012c28b58ada
Manuscripts and Archives Division, The New York Public Library. (1907). Riker, Douglas Hudson Retrieved from https://digitalcollections.nypl.org/items/05ba1d20-dd1a-0135-d77f-012c28b58ada
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