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- [S1910] 1910 United States Federal Census, (National Archives and Records Administration, Washington D. C., 1910), 1910.
- [S1900] 1900 United States Federal Census, (National Archives and Records Administration, Washington D. C., 1900), 1900.
- [S201] National Archives and Records Administration, WW I Draft Registration Cards, (National Archives and Records Administration, Washington D.C.), 201.
- [S602] Obituary Online, Elmer C. Larkin, The Times Herald (Port Huron, MI), July 1, 1958, p. 7., 602.
- [S1920] 1920 United States Federal Census, (National Archives and Records Administration, Washington D. C., 1920), 1920.
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