https://mappingthelives.org/bio/db7204a7-bddd-4f79-b687-fc092a56f803?language=en
https://www.alemannia-judaica.de/niedermendig_synagoge.htm
Karl Schaefer (1881 - 1942) - Genealogy
His story:
Schäfer, Karl – Aktives Gedenkbuch
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