When copying data from this family tree, please include a reference to the origin: J.H.Douma, "Family tree Douma", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-douma/I16438.php : accessed May 8, 2024), "Baron Hendrik Johan Herman van Boetzelaer (1876-1952)".
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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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