Check the information Open Archives has about Hartmans.
Check the Wie (onder)zoekt wie? register to see who is (re)searching Hartmans.
The Spier wereldwijd onderzoek publication was prepared by Jan Nienhuis (contact is not possible).
When copying data from this family tree, please include a reference to the origin: Jan Nienhuis, "Spier wereldwijd onderzoek", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-spier/I3136.php : accessed January 29, 2026), "Anna Elsy Hartmans".
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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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