When copying data from this family tree, please include a reference to the origin: Willem Vlietstra, "Family tree families Vlietstra, Piebes en aangetrouwde families", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-vlietstra-piebes/I1072310044.php : accessed June 13, 2024), "Grietje Zwiers".
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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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