When copying data from this family tree, please include a reference to the origin: Kees Helmich, "Family tree Helmich", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-helmich/I14826.php : accessed February 19, 2026), "Bernardus Joannes "Berend Jan" Koorssen (± 1733-1820)".
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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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