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"Pennsylvania, Philadelphia City Births, 1860-1906," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VBTV-HWY : 8 December 2014), Charles M. Maurer in entry for Raymond Francis Maurer, 24 May 1904; citing cn 25780, Department of Records; FHL microfilm 2,111,094.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MGD2-N9T : accessed 3 May 2017), Lavinia E Maurer in household of Charles M Maurer, Philadelphia Ward 1, Philadelphia, Pennsylvania, United States; citing enumeration district (ED) ED 21, sheet 31A, family 523, NARA microfilm publication T624 (Washington D.C.: National Archives and
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MXSF-FS1 : accessed 3 May 2017), Lavinia Maurer, Philadelphia Ward 39, Philadelphia, Pennsylvania, United States; citing ED 1396, sheet 10A, line 31, family 175, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1640; FHL microfilm 1,821,640.
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