"United States Census, 1850," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MX3N-LBC : 21 December 2020), David Bourn in household of Benj Bourn, Milford Township, Butler, Ohio, United States; citing family , NARA microfilm publication (Washington, D.C.: National Archives and Records Administration, n.d.).
"United States Census, 1880," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MZ1X-4S2 : 13 November 2020), David Bourne in household of Ezra Bourne, Butler, Ohio, United States; citing enumeration district ED 24, sheet 159C, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,254,996.
Find a Grave, database and images (https://www.findagrave.com : accessed 05 January 2021), memorial page for David Bourne (2 Feb 1832–30 Apr 1900), Find A Grave: Memorial #71140116, citing Somerville Cemetery, Somerville, Butler County, Ohio, USA ; Maintained by Jetta McQuiston (contributor 46925865) .
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