"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MS9L-79P : accessed 17 June 2020), Mary C Hensel in household of Charles Hensel, Waterford township, Oakland, Michigan, United States; citing enumeration district (ED) 109, sheet 8B, family 200, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,735.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MLR2-P61 : accessed 17 July 2020), Mary Gaukler in household of Fred W Gaukler, Pontiac Ward 2, Oakland, Michigan, United States; citing enumeration district (ED) ED 139, sheet 11B, family 232, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 668; FHL microfilm 1,374,681.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZQR-TWJ : accessed 17 July 2020), Mary C Gankler in household of Fred W Gankler, Pontiac Ward 2, Oakland, Michigan, United States; citing ED 184, sheet 7A, line 47, family 135, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 790; FHL microfilm 1,820,790.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XQ1G-VGS : accessed 17 July 2020), Mary C Gaukler in household of Fred W Gaukler, Pontiac, Oakland, Michigan, United States; citing enumeration district (ED) ED 77, sheet 2B, line 74, family 41, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1018; FHL microfilm 2,340,753.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K4P3-NCN : 15 May 2020), Mary Gaukler in household of Fred W Gaukler, Area B, Pontiac, Pontiac City, Oakland, Michigan, United States; citing enumeration district (ED) 63-100, sheet 5A, line 7, family 104, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 1801.
"Michigan Marriages, 1868-1925," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:N3VS-WH3 : 2 April 2020), Frederick Wm. Gankler and Marie Hensel, 24 Apr 1907; citing Marriage, Pontiac, Oakland, Michigan, , Citing Secretary of State, Department of Vital Records, Lansing; FHL microfilm 4209139.
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