When copying data from this family tree, please include a reference to the origin: A.W.M. (Dolf) van der Valk, "Family tree Van der Valk", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-van-der-valk/I47074.php : accessed May 28, 2024), "Jurrian Willem Tjeenk Willink".
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Please stick to the following rules
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.
Do not use this data until you have checked it, preferably at the source (the archives).
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