Informatie van Erik Verhagen, met gebruikmaking van info van N. Plomp, Z. Plomp-Kamphuis en S.M. Verhagen uit Sneek: 'Bijdragen tot de genealogie van een geslacht Verhagen in Rijnland en Delfland' enWillem Verhagen: het nageslacht van Bernardus Cornelis Verhagen (6 april 1825)
When copying data from this family tree, please include a reference to the origin: Henk Jan Verhagen, "Genealogy Verhagen - van Welsum", database, Genealogy Online (https://www.genealogieonline.nl/genealogie-verhagen-van-welsum/I1053.php : accessed September 25, 2024), "Jan Adriaensz. van der Marck (± 1548-± 1637)".
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