The Whitehills in America (Heroes and Heroines) written and edited by Samuel Milliken Whitehill, Jr., Patricia Whitehill Halter, and Cassius Furman Whitehill, Jr. (Family Heritage Publishers) p. 297
"Ohio, County Births, 1841-2003," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X6ZZ-B9P : 9 March 2018), Robert Benton Blackwood in entry for Guy Robert Blackwood, 19 Sep 1902; citing Birth, Bellefontaine, Logan, Ohio, United States, county courthouses, Ohio; FHL microfilm 534,832.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MLF4-H8X : accessed 11 July 2018), Robert B Blackwood, Bellefontaine Ward 1, Logan, Ohio, United States; citing enumeration district (ED) ED 126, sheet 8A, family 202, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1204; FHL microfilm 1,375,217.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MD1R-XZF : accessed 11 July 2018), Minnie Blackwood, Bellefontaine Ward 1, Logan, Ohio, United States; citing ED 187, sheet 10A, line 20, family 286, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1405; FHL microfilm 1,821,405.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X44F-29F : accessed 12 July 2018), Guy Blackwood in household of Clarence E Schroeder, Toledo, Lucas, Ohio, United States; citing enumeration district (ED) ED 231, sheet 2A, line 46, family 34, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1837; FHL microfilm 2,341,571.
U S Social Security Death Index
"Ohio Death Index, 1908-1932, 1938-1944, and 1958-2007," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VKVP-1F9 : 8 December 2014), Guy R Blackwood, 01 Feb 1976; from "Ohio, Deaths, 1908-1932, 1938-2007," database and images, Ancestry (http://www.ancestry.com : 2010); citing vol. 22428, certificate number 020540, Ohio Historical Society, Columbus; Ohio Department of Health, State Vital Statistics Unit, Columbus.
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