When copying data from this family tree, please include a reference to the origin: G. Meijerink, "Family tree De Groot uit Kampen", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-de-groot-uit-kampen/I1102.php : accessed May 25, 2024), "Jan Jansen van Keulen (± 1756-????)".
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