Check the information Open Archives has about Valckhoff.
Check the Wie (onder)zoekt wie? register to see who is (re)searching Valckhoff.
The Family tree Van Willigen publication was prepared by Rob van Willigen (contact is not possible).
When copying data from this family tree, please include a reference to the origin: Rob van Willigen, "Family tree Van Willigen", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-van-willigen/I12623.php : accessed February 16, 2026), "Aert Cornelisse Valckhoff".
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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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