↑ "United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M39J-6MH : accessed 22 November 2016), Mary V Nicholas in household of Anna M Nicholas, London Grove Township, Southern Precinct (excl. Avondale & West Grove boroughs), Chester, Pennsylvania, United States; citing enumeration district (ED) 83, sheet 13A, family 254, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,393.
↑ "United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MG37-GBH : accessed 22 November 2016), Mary N Lafever in household of George L Lafever, London Grove, Chester, Pennsylvania, United States; citing enumeration district (ED) ED 36, sheet 5A, family 98, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1328; FHL microfilm 1,375,341.
↑ "United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MFRF-85C : accessed 22 November 2016), Mary Lafevre in household of George Lafevre, London Grove, Chester, Pennsylvania, United States; citing enumeration district (ED) ED 48, sheet 2B, line 54, family 33, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1550; FHL microfilm 1,821,550..
↑ "United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XHD7-56L : accessed 22 November 2016), Mary V Le Fevra in household of George L Le Fevra, London Grove, Chester, Pennsylvania, United States; citing enumeration district (ED) ED 46, sheet 3A, line 45, family 63, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2019; FHL microfilm 2,341,753..
↑ "United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KQ82-4K7 : accessed 22 November 2016), Mary J Lefever in household of George L Lefever, London Grove Township, Chester, Pennsylvania, United States; citing enumeration district (ED) 15-48, sheet 1A, line 30, family 119, 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 3465.
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