When copying data from this family tree, please include a reference to the origin: Nico van Gogh, "Family tree Dörr", database, Genealogy Online (https://www.genealogieonline.nl/dorr-stamboom/I12.php : accessed January 16, 2026), "Maria Siever".
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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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