When copying data from this family tree, please include a reference to the origin: Aad van der Heiden, "Family tree van der Heiden, Roth, van der Hek, de Groot", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-van-der-heiden-roth-van-der-hek-de-groot/I14220.php : accessed June 10, 2024), "Jacobus Cousijnse".
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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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