When copying data from this family tree, please include a reference to the origin: Serge van Nuijs (Antwerpen), "Genealogy takken "van Nuijs" en "Hoogers"", database, Genealogy Online (https://www.genealogieonline.nl/genealogie_nuijs_hoogers/I31818.php : accessed May 23, 2024), "Johannes Matheus Helzen (< 1799-1856)".
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