"United States Census, 1930," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:X9SQ-DW5 : accessed 12 July 2022), Louis P Hartmann in household of Peter Hartmann, West Allis, Milwaukee, Wisconsin, United States; citing enumeration district (ED) ED 395, sheet 2A, line 49, family 40, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2601; FHL microfilm 2,342,335.
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