"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZ2K-SYN : 17 October 2014), Hellen Pierce in household of Duane Pierce, Pennsylvania, United States; citing p. 11, family 77, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,959.
"New York State Census, 1875," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VNV1-MP6 : 16 November 2014), Hellin Pierce in household of Duane Pierce, Buffalo, Erie, New York, United States; citing p. 11, line 26, State Library, Albany; FHL microfilm 825,688.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZ89-YXZ : 14 July 2016), Hellen Pierce in household of Duane Pierce, Buffalo, Erie, New York, United States; citing enumeration district ED 166, sheet 235C, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0831; FHL microfilm 1,254,831.
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