"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M3MT-F46 : accessed 11 June 2021), Helen R Whelan in household of Rachel Whelan, Precinct 2 Altoona city Ward 3, Blair, Pennsylvania, United States; citing enumeration district (ED) 47, sheet 6A, family 91, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,380.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MGQZ-GP2 : accessed 11 June 2021), Helen Whelan in household of Ray Whelan, Wilkinsburg Ward 3, Allegheny, Pennsylvania, United States; citing enumeration district (ED) ED 659, sheet 6A, family 148, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1298; FHL microfilm 1,375,311.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XHHT-122 : accessed 11 June 2021), Helen R Dahl in household of Edw S Dahl, Sewickley, Westmoreland, Pennsylvania, United States; citing enumeration district (ED) ED 150, sheet 2A, line 24, family 25, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2159; FHL microfilm 2,341,893.
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