Check the information Open Archives has about Horn.
Check the Wie (onder)zoekt wie? register to see who is (re)searching Horn.
The Family tree Cobussen publication was prepared by Kees Cobussen (contact is not possible).
When copying data from this family tree, please include a reference to the origin: Kees Cobussen, "Family tree Cobussen", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-cobussen/I488.php : accessed February 13, 2026), "Johan Christopher Horn".
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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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