A maiden name of Ainsworth has been added for Mary on Find A Grave, but the source for that is unknown.
Sources
"United States Census, 1870," index and images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M4X6-P21 : accessed 1 May 2015), Mary E Dinsmore in household of James Dinsmore, Missouri, United States; citing p. , family 18, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,267.
"United States Census, 1880," index and images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M66G-WXL : accessed 1 May 2015), Mary L Dinsmore in household of James Dinsmore, Keytesville, Chariton, Missouri, United States; citing enumeration district 167, sheet 492A, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0680; FHL microfilm 1,254,680.
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