"Illinois, Cook County Marriages, 1871-1920," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/N76C-GXH : accessed 16 February 2015), William O'Neill and Mary Hogan, 08 Jan 1890; citing Chicago, Cook, Illinois, 148293, Cook County Courthouse, Chicago; FHL microfilm 1,030,188.
"United States Census, 1900," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MM2K-8RD : accessed 16 February 2015), Mary O'Neal in household of William O'Neal, Lake Geneva city Ward 1-3, Walworth, Wisconsin, United States; citing sheet 14B, family 349, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,241,821.
"Wisconsin, State Census, 1905," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MMQD-898 : accessed 16 February 2015), Mary O'Neill in household of William O'Neill, Lake Geneva, Walworth, Wisconsin; citing p. 295, line 50, State Historical Society, Madison; FHL microfilm 1,020,987.
"United States Census, 1920," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MFLW-RCX : accessed 16 February 2015), Mary O'Neill in household of William O'Neill, Lake Geneva Ward 2, Walworth, Wisconsin, United States; citing sheet 4A, family 93, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,822,019.
"United States Census, 1930," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/X93Q-BDG : accessed 16 February 2015), Mary H Oneill, Lake Geneva, Walworth, Wisconsin, United States; citing enumeration district (ED) 0018, sheet 28A, family 739, line 1, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2615; FHL microfilm 2,342,349.
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