When copying data from this family tree, please include a reference to the origin: Jan Verkade, "Family tree Verkade-van Zantvliet", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-verkade-van-zantvliet/I730.php : accessed May 14, 2024), "Johanna Gijsbrechtsdr Valkenburg (1731-????)".
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