"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MFZB-VZ8 : accessed 6 October 2017), Gertrude M Mayo in household of Fred A Mayo, Medford, Piscataquis, Maine, United States; citing ED 145, sheet 6B, line 72, family 98, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 647; FHL microfilm 1,820,647.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XMDH-R9V : accessed 6 October 2017), Gertrude M Mayo in household of Fred A Mayo, Milo, Piscataquis, Maine, United States; citing enumeration district (ED) ED 30, sheet 15B, line 92, family 365, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 838; FHL microfilm 2,340,573.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JTB4-JT5 : 19 May 2014), Gertrude M Smith, 09 Feb 2001; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
"Find A Grave Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QVGL-TVBY : 11 July 2016), Gertrude Marion Mayo Smith, 2001; Burial, Malone, Franklin, New York, United States of America, Morningside Cemetery; citing record ID 125267189, Find a Grave, http://www.findagrave.com.
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