When copying data from this family tree, please include a reference to the origin: Hedwich de Vries, "Family tree Jacobus Petrus van Dorp en Paula Frederike Sommerfelt", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-van-dorp-sommerfelt/I214.php : accessed June 18, 2024), "Jacob Katers".
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