Groningse doopsgezinden » Sources » Diverse Groningse families; http://www.ostfriesischelandschaft.de/fileadmin/user_upload/BIBLIOTHEK/BLO/DoornkaatKoolman_Jan_I.pdf; "Doopsgezinde families in het Oldambt 1520-1811 van S. H. Abels (deel 1)
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