Title: 1880 Census - Philadelphia, PA FHL Film 1255185 National Archives Film T9-1185 Page 404B
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MWJY-YKL : 16 July 2017), Mary Gettz in household of David Gettz, Philadelphia, Philadelphia, Pennsylvania, United States; citing enumeration district ED 544, sheet 404B, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 1185; FHL microfilm 1,255,185.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M3SZ-YYD : accessed 5 April 2016), Mary Gettz in household of David Gettz, Haverford Township, Delaware, Pennsylvania, United States; citing sheet 23A, family 406, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,241,405.
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It may be possible to confirm family relationships with Mary by comparing test results with other carriers of her mitochondrial DNA.
Mitochondrial DNA test-takers in the direct maternal line: