"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M3L2-K9V : accessed 22 March 2017), Hartwell D Cox in household of Hartwell B Cox, Justice Precinct 4, Dallas, Texas, United States; citing enumeration district (ED) 136, sheet 3B, family 58, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,626.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2M3-354 : accessed 22 March 2017), Hartwell Decker Cox in household of H B Cox, Justice Precinct 4, Dallas, Texas, United States; citing enumeration district (ED) ED 93, sheet 1A, family 3, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1545; FHL microfilm 1,375,558.
"Texas, World War I Records, 1917-1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QV18-JVSZ : 3 April 2015), Decker H Cox, 02 Apr 1917; citing Military Service, Dallas, , Texas, United States, Texas Military Forces Museum, Austin.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MCM3-BG6 : accessed 22 March 2017), Soldier Deckor Cox, Justice Precinct 1, Dallas, Texas, United States; citing ED 3, sheet 6B, line 90, family 87, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1791; FHL microfilm 1,821,791.
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