When copying data from this family tree, please include a reference to the origin: R.F.F. Langen, "Family tree Muller", database, Genealogy Online (https://www.genealogieonline.nl/stamboom_muller/I540.php : accessed January 24, 2026), "Louis Herman Johannes Schwartz".
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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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