"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XSYC-FKZ : accessed 9 April 2018), Mary J Duncan, Isabel, Fulton, Illinois, United States; citing enumeration district (ED) ED 31, sheet 4A, line 42, family 90, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 514;FHL microfilm 2,340,249.