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/I2100.php : accessed May 30, 2024), "Joannes Caeltjes".
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Please stick to the following rules
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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