Gertrude was born in 1881. She passed away in 1949.
Sources
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MS1Z-VHH : accessed 15 January 2021), Gertrude M. Hartzell in household of Lebright Hartzell, Reading Township, Adams, Pennsylvania, United States; citing enumeration district (ED) 26, sheet 12A, family 275, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,354.
"Pennsylvania, County Marriages, 1885-1950," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:VFWC-62W : 5 August 2020), Charles Henry Mummert and Gertrude May Hartzel, 24 Oct 1901; citing Marriage, Abbottstown, Adams, Pennsylvania, United States, multiple County Clerks, Pennsylvania.
"United States Census, 1910," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MGDM-96Y : accessed 15 January 2021), Everude M Mummert in household of Charles H Mummert, Penn Township, York, Pennsylvania, United States; citing enumeration district (ED) ED 88, sheet 3A, family 58, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1434; FHL microfilm 1,375,447.
"United States Census, 1920," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:M6BC-FCY : accessed 15 January 2021), Charles Mummert, York, Pennsylvania, United States; citing ED 57, sheet 3A, line 12, family 62, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1668; FHL microfilm 1,821,668.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XHCZ-DJQ : accessed 15 January 2021), Gertrude M Mumnert in household of Charles H Mumnert, Hanover, York, Pennsylvania, United States; citing enumeration district (ED) ED 28, sheet 21B, line 57, family 584, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2165; FHL microfilm 2,341,899.
"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:KQW3-6QQ : 7 January 2021), Gertrude M Mummert in household of Charles H Mummert, Hanover, York, Pennsylvania, United States; citing enumeration district (ED) 67-31, sheet 11A, line 29, family 340, 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 3642.
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