When copying data from this family tree, please include a reference to the origin: Viviënne Crutzen, "Genealogy van der Does Roumen van Helden", database, Genealogy Online (https://www.genealogieonline.nl/genealogie-van-der-does-roumen-van-helden/I61071678.php : accessed June 3, 2024), "Jan hendrik Ackermans".
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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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