When copying data from this family tree, please include a reference to the origin: Dirk Koppenol, "Familiekring Koppenol-van Starkenburg", database, Genealogy Online (https://www.genealogieonline.nl/familiekring-koppenol-van-starkenburg/I252673.php : accessed June 5, 2024), "Aaltje Maartens van Duijn (1861-1943)".
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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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