When copying data from this family tree, please include a reference to the origin: Marga van der Velden, "Family tree Van der Velden, Gesink, Blonk, Seijmonsbergen, vd Geur", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-van-der-velden/I2968.php : accessed June 24, 2024), "Harmen Adolph Mangelis".
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