When copying data from this family tree, please include a reference to the origin: André Rijkeboer, "Family tree Rijkeboer-Dikker", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-rijkeboer-dikker/I56187.php : accessed June 19, 2024), "Willem Gerrardus van Kalker (1877-1948)".
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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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