When copying data from this family tree, please include a reference to the origin: Leon Ten Koppel, "Family tree Familie-archief Ten Koppel", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-familie-archief-ten-koppel/I1951.php : accessed May 30, 2024), "Janna van Maanen (± 1806-????)".
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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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