"United States Census, 1860," Internet Archive (https://archive.org/stream/14thcensusofpopu376unit#page/n949/mode/2up: accessed 26 August 2018), Mary Wekheiser wife of John Werkheiser. 2nd Ward Trenton, Mercer, New Jersey. Citing page 773, Family 51, line 25, NARA microfilm publication M653 (Washington D.C.: National Archives and Records Administration, 2002), roll 698; FHL microfilm 803698.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MN8N-7XY : 29 August 2017), Mary Werkheiser in household of John N Werkheiser, Trenton, Mercer, New Jersey, United States; citing enumeration district ED 103, sheet 263A, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0788; FHL microfilm 1,254,788.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9F2-GGH : accessed 27 August 2018), Mary Werkheiser wife of John Werkheiser, Precinct 3 Trenton city Ward 3, Mercer, New Jersey, United States; citing enumeration district (ED) 64, sheet 2B, family 42, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,982.
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