When copying data from this family tree, please include a reference to the origin: Rob Vollmar, "Family tree Vollmar, Krüse, Jonker, Van Gulik", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-vollmar/R4626.php : accessed January 24, 2026), "Joannis van den Biggelaar (1740-????)".
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