When copying data from this family tree, please include a reference to the origin: J.W. Martens, "Family tree Martens IJsselstreek", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-martens-ijsselstreek/I31337.php : accessed June 19, 2024), "Peter Theunis (± 1680-????)".
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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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