"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MXYF-GWQ : accessed 18 July 2020), Herbert W Mann in household of Max O Mann, Lawrence Ward 1, Essex, Massachusetts, United States; citing ED 88, sheet 10B, line 82, family 223, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 692; FHL microfilm 1,820,692.
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