"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MLFK-T3M : accessed 9 January 2018), Mark W Howel in household of Thos M Howel, Circleville, Pickaway, Ohio, United States; citing enumeration district (ED) ED 139, sheet 10A, family 6, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1223; FHL microfilm 1,375,236.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MD1Y-LWF : accessed 9 January 2018), Mark Howell in household of Thomas Howell, Circleville Ward 3, Pickaway, Ohio, United States; citing ED 90, sheet 2A, line 8, family 32, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1427; FHL microfilm 1,821,427.
"Ohio, County Marriages, 1789-2013," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:2QW6-B9T : 8 December 2017), Mark W Howell and Martha M Kinney, 26 Dec 1932; citing Pickaway, Ohio, United States, reference ; county courthouses, Ohio; FHL microfilm 1,927,444.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KWLQ-ZZ3 : accessed 9 January 2018), Mark W Howell, Ward 3, Circleville City, Circleville Township, Pickaway, Ohio, United States; citing enumeration district (ED) 65-6, sheet 2B, line 72, family 45, 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 3128.
"Ohio Death Index, 1908-1932, 1938-1944, and 1958-2007," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VKY6-65K : 8 December 2014), Mark W Howell, 30 Oct 1976; from "Ohio, Deaths, 1908-1932, 1938-2007," database and images, Ancestry (http://www.ancestry.com : 2010); citing vol. 22636, certificate number 072554, Ohio Historical Society, Columbus; Ohio Department of Health, State Vital Statistics Unit, Columbus.
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