"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MLPH-S46 : 29 October 2015), Opal E Martin in household of George H Martin, Otsego, Allegan, Michigan, United States; citing enumeration district (ED) ED 24, sheet 8B, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,374,647.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZSS-8LK : 14 December 2015), Opal Ester Martin in household of George H Martin, Martin, Allegan, Michigan, United States; citing sheet 2B, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,820,753.
"United States Census, 1930", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XQB6-8RN : 8 December 2015), Opal Bane in entry for George Martin, 1930.
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