When copying data from this family tree, please include a reference to the origin: P. den Os, "Family tree Den Os open eindjes 2015", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-den-os-open-eindjes/I50707136.php : accessed June 22, 2024), "Wilhelmina Federika Koch".
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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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