When copying data from this family tree, please include a reference to the origin: Herman van de Kolk, "Family tree Van de Kolk; volkstelling Nunspeet 1797", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-van-de-kolk-nunspeet/I31874.php : accessed May 25, 2024), "Gerrigje Heerdink (1882-1918)".
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