Check the information Open Archives has about Hilberts Koops.
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The Family tree Doppenberg publication was prepared by Henk Doppenberg (contact is not possible).
When copying data from this family tree, please include a reference to the origin: Henk Doppenberg, "Family tree Doppenberg", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-doppenberg/I6677.php : accessed February 21, 2026), "Jan Hilberts Koops".
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