When copying data from this family tree, please include a reference to the origin: Joke Koster, "Family tree Griffioen Jellema Friese Adel", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-griffioen-koster/I83434.php : accessed June 15, 2024), "Klaas Johannes Gercama (± 1770-????)".
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