Check the information Open Archives has about Verkade.
Check the Wie (onder)zoekt wie? register to see who is (re)searching Verkade.
The Family tree Sluiter publication was prepared by M. J. Sluiter (contact is not possible).
When copying data from this family tree, please include a reference to the origin: M. J. Sluiter, "Family tree Sluiter", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-sluiter/I698.php : accessed January 19, 2026), "Jacob Verkade".
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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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