"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MN3X-PVF : 12 April 2016), Charles E Hellen in household of William D Hellen, Maryland, United States; citing p. 33, family 219, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,086.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MNQ5-RFS : 15 August 2017), Charles Hellen in entry for William D Hellen, 1880; citing enumeration district ED 110, sheet 275C, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d), roll 0512; FHL microfilm 1,254,512.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9TD-K49 : accessed 16 March 2019), Chas E Hellen, Newton city Ward 7, Middlesex, Massachusetts, United States; citing enumeration district (ED) 911, sheet 7A, family 121, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,664.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MG6Z-3SQ : accessed 16 March 2019), Charles E Hellen, Sewickley, Allegheny, Pennsylvania, United States; citing enumeration district (ED) ED 222, sheet 13B, family , NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1297; FHL microfilm 1,375,310.
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