"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MDZ4-L79 : 12 April 2016), Martha J Mann in household of John Mann, Daviess county, Daviess, Missouri, United States; citing family 386, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
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