When copying data from this family tree, please include a reference to the origin: Harm Jan Luth-Mulders, "Genealogische Databank Maassluis", database, Genealogy Online (https://www.genealogieonline.nl/genealogische-databank-maassluis/I65328.php : accessed June 9, 2024), "Sijtje Ariens van der Graaff (< 1640-????)".
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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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