"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MW62-K68 : 10 August 2016), Mary E Collings in household of Thos James, Pittsburgh, Allegheny, Pennsylvania, United States; citing enumeration district ED 152, sheet 8D, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 1094; FHL microfilm 1,255,094.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MS1R-GZQ : accessed 7 February 2017), Mary Collins in household of Edwin Collins, Precinct 2 Pittsburgh city Ward 23, Allegheny, Pennsylvania, United States; citing enumeration district (ED) 266, sheet 15A, family 251, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,363.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MGCY-WM3 : accessed 29 September 2017), Mary E Collins in household of Edwin Collins, Pittsburgh Ward 15, Allegheny, Pennsylvania, United States; citing enumeration district (ED) ED 472, sheet 8B, family 147, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1304; FHL microfilm 1,375,317.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M6T2-C4N : accessed 29 September 2017), Mary Collins in household of Edwin Collins, Pittsburgh Ward 15, Allegheny, Pennsylvania, United States; citing ED 555, sheet 11B, line 66, family 221, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1523; FHL microfilm 1,821,523.
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