When copying data from this family tree, please include a reference to the origin: J. van Gelder, "Family tree familie Van Gelder, Goudswaard, Koning en Hensens", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-familie-van-gelder/I2503.php : accessed June 18, 2024), "Jakob Kalk (1861-????)".
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