"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MDVB-R78 : accessed 8 March 2016), Martha Willits in household of Morton Willits, Iowa, United States; citing p. 29, family 225, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 545,919.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MDKB-BX8 : accessed 8 March 2016), Mattie Willitts in household of M H Willitts, Atlantic, Cass, Iowa, United States; citing enumeration district ED 32, sheet 494A, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0330; FHL microfilm 1,254,330.
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