When copying data from this family tree, please include a reference to the origin: Marjan Groenen, "Family tree Groenen, van Hummel en Nijholt", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-groenen-van-hummel-en-nijholt/I172.php : accessed June 16, 2024), "Johannes van Hummel (< 1660-± 1740)".
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