"United States Census, 1910," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MK6K-B2C : accessed 10 January 2021), Katie Schmidt in household of Frank Schmidt, Madison, Illinois, United States; citing enumeration district (ED) ED 58, sheet 325A, family 450, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 310; FHL microfilm 1,374,323.
"United States Census, 1930," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:XS13-452 : accessed 10 January 2021), Catherine Schmidt in household of Frank Schmidt, Alton, Madison, Illinois, United States; citing enumeration district (ED) ED 4, sheet 20B, line 77, family 515, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 540; FHL microfilm 2,340,275.
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