When copying data from this family tree, please include a reference to the origin: Frits Derksen, "Family tree Derikx, Derksen en Heijnen", database, Genealogy Online (https://www.genealogieonline.nl/parenteel-derksen/I3347.php : accessed June 1, 2024), "Johan "Jan" van Duivenvoorde".
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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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