↑ Burgerlijke Stand Geboorte 1840, Bruinisse, Zeeland, Nederland. Akte 69 (1840-12-24), Zeeuws Archief accessed via OpenArch Permalink
"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZ4D-3V9 : 12 April 2016), John Fevorburg in household of Kain Fevorburg, Dubuque county, Dubuque, Iowa, United States; citing family 1083, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
"Iowa, County Marriages, 1838-1934," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XJ2Z-W92 : 4 November 2017), John Vyverberg and Caroline Sieber, 29 May 1873, Peru Township, Dubuque, Iowa, United States; citing reference bk 3 p 569 cn 154, county courthouses, Iowa; FHL microfilm 1,035,387.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MD28-3BC : 14 August 2017), John Vyverberg, 1880; citing enumeration district ED 184, sheet 409B, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d), roll 0338; FHL microfilm 1,254,338.
"Iowa State Census, 1885," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:HZ93-T3Z : 11 March 2018), John Vyverberg in household of Elizabeth Vanderhaas, Peru, Dubuque, Iowa; citing p. 29, 1885, State Historical Society, Des Moines; FHL microfilm 1,021,464.
"Iowa, County Death Records, 1880-1992," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QVMN-JSZ9 : 17 March 2018), John Viverberg, 09 Mar 1889; citing Death, Pern, Dubuque, Iowa, United States, page 256, offices of county clerk from various counties; FHL microfilm 1,035,307.
Find A Grave, database and images (https://www.findagrave.com : accessed 06 August 2019), memorial page for John Vyverberg (24 Dec 1840–9 Mar 1889), Find A Grave Memorial no. 77851269, citing Sherrill Presbyterian Cemetery, Sherrill, Dubuque County, Iowa, USA ; Maintained by Cheryl Locher Moonen (contributor 47601076) .
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