"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MKD3-QNJ : accessed 9 April 2018), Mary J Duncan in household of Charles Duncan, Isabel, Fulton, Illinois, United States; citingenumeration district (ED) ED 88, sheet 3B, family 56, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 288; FHL microfilm 1,374,301.