When copying data from this family tree, please include a reference to the origin: Huib van der Weijden, "Family tree Erkelens, Kooper, Dalm en aanverwanten", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-erkelens-kooper-dalm-en-aanverwanten/I1644.php : accessed June 6, 2024), "Cornelis Arie van der Hert (1915-< 2008)".
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