When copying data from this family tree, please include a reference to the origin: Piet op den Camp, "Family tree Stein, Elsloo, Catsop, Urmond, Berg aan de Maas en meer", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-stein-en-omgeving/I10216.php : accessed May 15, 2024), "Guilelmus Janssen (????-1719)".
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