Check the information Open Archives has about Van Warmerdam.
Check the Wie (onder)zoekt wie? register to see who is (re)searching Van Warmerdam.
The Family tree Mark de Jong publication was prepared by M. de Jong (contact is not possible).
When copying data from this family tree, please include a reference to the origin: M. de Jong, "Family tree Mark de Jong", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-mark-de-jong/I3589.php : accessed February 27, 2026), "Jan van Warmerdam".
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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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