When copying data from this family tree, please include a reference to the origin: J. den Nieuwenboer, "Family tree Den Nieuwenboer", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-den-nieuwenboer/I10140.php : accessed May 11, 2025), "Johannes Oorthuizen (± 1822-????)".
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Request permission to copy data or at least inform the author, chances are that the author gives permission, often the contact also leads to more exchange of data.
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