"United States Census, 1880," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MDLX-TZD : 14 January 2022), John Witt, Davenport, Scott, Iowa, United States; citing enumeration district , sheet , NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm .
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MKXD-N6F : accessed 7 May 2023), John C Witt in household of Julius C Witt, Rock Island Ward 7, Rock Island, Illinois, United States; citing enumeration district (ED) ED 127, sheet 2A, family 29, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 321; FHL microfilm 1,374,334.
Find a Grave, database and images (https://www.findagrave.com/memorial/123467481/john-c-witt: accessed 07 May 2023), memorial page for John C Witt (13 Jan 1839–3 Nov 1927), Find A Grave: Memorial #123467481, citing Immanuel Lutheran Cemetery, Rock Island, Rock Island County, Illinois, USA; Maintained by Ree (contributor 47329830).
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