"Netherlands, Archival Indexes, Vital Records," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q2BG-1R47 : 22 August 2017), Dirkje Gabel in entry for Johannes van Katwijk and Antje Mulder, Marriage 05 Aug 1925, Schiedam, South Holland, Netherlands; from database, openarchives (https://www.openarch.nl : 2016); citing Gemeentearchief Schiedam - BS Huwelijk, Schiedam, record number 164; ; Gemeentearchief Schiedam.
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