"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MSQ6-XML : accessed 29 April 2018), Alexander Warren in household of Minnie Warren, Precinct 30 Lake View Chicago city Ward 25, Cook, Illinois, United States; citing enumeration district (ED) 769, sheet 18A, family 296, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,275.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MKZ2-QTL : accessed 29 April 2018), Alexander C Warren in household of Minnie A Warren, Chicago Ward 25, Cook, Illinois, United States; citing enumeration district (ED) ED 1067, sheet 13A, family 324, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 268; FHL microfilm 1,374,281.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MJWL-L6J : accessed 29 April 2018), A C Warren, Elmhurst, Dupage, Illinois, United States; citing ED 29, sheet 11B, line 56, family 245, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 365; FHL microfilm 1,820,365.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XSY3-SXF : accessed 29 April 2018), Alexander C Warren, York, DuPage, Illinois, United States; citing enumeration district (ED) ED 6, sheet 18A, line 15, family 463, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 511; FHL microfilm 2,340,246.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KW4P-35T : accessed 29 April 2018), Alexander C Warren, Ward 4, Elmhurst, York Township, DuPage, Illinois, United States; citing enumeration district (ED) 22-8, sheet 16A, line 37, family 330, 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 796.
"United States World War I Draft Registration Cards, 1917-1918," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K6D3-TWF : 13 March 2018), Alexander Clifton Warren, 1917-1918; citing DuPage County, Illinois, United States, NARA microfilm publication M1509 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,613,183.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:J257-LJC : 19 May 2014), Alexander C Warren, 15 Jul 1966; 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:QK16-9Q1Q : 15 December 2015), Alexander Clifton Warren, 1966; Burial, Chicago, Cook, Illinois, United States of America, Graceland Cemetery; citing record ID 139352199, Find a Grave, http://www.findagrave.com.
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