When copying data from this family tree, please include a reference to the origin: Jennifer Thompson, "Family tree Johnson", database, Genealogy Online (https://www.genealogieonline.nl/family-tree-johnson/I884763839.php : accessed June 18, 2024), "Jan Karels Janssen (± 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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