When copying data from this family tree, please include a reference to the origin: Joop, "Family tree Vermaas_de_ Visser", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-vermaas-de-visser-loene/I1119.php : accessed June 12, 2025), "Helena Maria Tonia von Mönching (1890-1973)".
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