"United States Census, 1930," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:X386-C8Y : accessed 31 October 2022), Bertha A Maruska in household of Thomas Maruska, Bellevue, Morrison, Minnesota, United States; citing enumeration district (ED) ED 3, sheet 2B, line 86, family 39, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1108; FHL microfilm 2,340,843.
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