"United States Census, 1910," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MGDM-2DQ : accessed 25 February 2021), Margaret E Nace in household of Howard G Nace, West Manheim Township, York, Pennsylvania, United States; citing enumeration district (ED) ED 106, sheet 1A, family 2, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1434; FHL microfilm 1,375,447.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XHCZ-FVQ : accessed 25 February 2021), Margaret E Blettner in household of John L Blettner, Hanover, York, Pennsylvania, United States; citing enumeration district (ED) ED 32, sheet 4A, line 39, family 93, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2165; FHL microfilm 2,341,899.
"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:KQW3-PFM : 7 January 2021), Margaret N Blettner in household of John L Blettner, Hanover, York, Pennsylvania, United States; citing enumeration district (ED) 67-41, sheet 5B, line 56, family 105, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 3642.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JY3Q-PMX : 8 January 2021), Margaret N Blettner, 12 Mar 2001; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
"United States, GenealogyBank Obituaries, 1980-2014," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QVT1-X8FW : accessed 25 February 2021), St Margaret Blettner, Pennsylvania, United States, 16 Mar 2001; from "Recent Newspaper Obituaries (1977 - Today)," database, GenealogyBank.com (http://www.genealogybank.com : 2014); citing York Daily Record, born-digital text.
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