When copying data from this family tree, please include a reference to the origin: Sam Stamboom, "Family tree Veenstra, Dijkstra, Peperkamp and Van den Dobbelsteen", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-boris-bas/I60448.php : accessed March 6, 2026), "Johannes Koopman".
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Please stick to the following rules
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.
Do not use this data until you have checked it, preferably at the source (the archives).
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