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- [S0008] Alle Friezen, (www.allefriezen.nl), Kollumerland, Gezinskaarten, 1920-1937 (Postmus-Schaaf) Gemeente: Kollumerland c.a. Periode: 1860-1880.
- [S0130] Find A Grave, (http://findagrave.com), Find A Grave Memorial# 35847236.
- [S0047] Familysearch, (www.familysearch.org), "Washington Death Certificates, 1907-1960," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:N356-MPN : 5 December 2014), Minard Roorda in entry for Theodore Roorda, 04 Jun 1932; citing Monroe, Snohomish, Washington, reference 215, Bureau of Vital Statistics, Olympia; FHL microfilm 2,022,967.
- [S0011] Alle Groningers, (www.allegroningers.nl), Huwelijksregister Oldehove 1912 Aktenummer 7.
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