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/I11442.php : accessed May 13, 2024), "Willem Knijpinga (1852-1935)".
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Request permission to copy data or at least inform the author, chances are that the author gives permission, often the contact also leads to more exchange of data.
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