When copying data from this family tree, please include a reference to the origin: Marthan Klein, "Families Klein, Ree, de Breed en de Vries van Terschelling", database, Genealogy Online (https://www.genealogieonline.nl/families-klein-ree-ea/I75803.php : accessed May 16, 2024), "Anna van Mazovië (1275-1337)".
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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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