When copying data from this family tree, please include a reference to the origin: Paul Snoeij, "Family tree Snoeij-van den Donker-Elich-Sundermeijer-Martens", database, Genealogy Online (https://www.genealogieonline.nl/stamboomonderzoek-snoeij/I16950.php : accessed May 12, 2024), "Wilhelm Dirk Karel Mackenbach".
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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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