Check the information Open Archives has about Cas.
Check the Wie (onder)zoekt wie? register to see who is (re)searching Cas.
The Genealogische database Eisenga publication was prepared by Ruut Eisenga (contact is not possible).
When copying data from this family tree, please include a reference to the origin: Ruut Eisenga, "Genealogische database Eisenga", database, Genealogy Online (https://www.genealogieonline.nl/genealogie-eisenga/I4165.php : accessed February 16, 2026), "Govert Willemsen Cas (± 1600-> 1670)".
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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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