When copying data from this family tree, please include a reference to the origin: Hans Middendorp, "Family Tree Family tree Middendorp uit Loppersum en Delfzijl in Groningen", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-middendorp-groningen/I3635.php : accessed May 4, 2024), "Jaapkien Roelfs Jager".
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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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