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- [S0008] Alle Friezen, (www.allefriezen.nl), Geboorteregister 1910, archiefnummer 30-21, Burgerlijke Stand Kollumerland c.a. - Tresoar, inventarisnummer 1050, aktenummer 142 Gemeente: Kollumerland c.a. Periode: 1910.
- [S0047] Familysearch, (www.familysearch.org), "Florida Death Index, 1877-1998," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VVNG-1K9 : 25 December 2014), Sybren Deboer, 12 Feb 1989; from "Florida Death Index, 1877-1998," index, Ancestry (www.ancestry.com : 2004); citing vol. , certificate number 22969, Florida Department of Health, Office of Vital Records, Jacksonville.
- [S0130] Find A Grave, (http://findagrave.com), https://www.findagrave.com/memorial/180207115/sybren-deboer.
- [S0008] Alle Friezen, (www.allefriezen.nl), Huwelijksregister 1899, archiefnummer 30-37, Burgerlijke Stand Tietjerksteradeel - Tresoar, inventarisnummer 2044, aktenummer 035 Gemeente: Tietjerksteradeel Periode: 1899.
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