"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZGN-3DR : 12 April 2016), Martha Kettring in household of Jacob Kettring, Pennsylvania, United States; citing p. 26, family 208, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,832.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MXKR-SJD : 7 September 2017), Martha Kettering in household of Jacob V Kettering, Hale, Warren, Illinois, United States; citing enumeration district ED 289, sheet 168D, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0256; FHL microfilm 1,254,256.
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