When copying data from this family tree, please include a reference to the origin: Ger de Vries, "Family tree I.D.M. de Vries", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-i-m-d-de-vries/I405.php : accessed May 20, 2024), "Johan van Alensberg (de Mascherel, bij Moresnet) (± 1465-????)".
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