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| Ferdinand Kettler. Duke of Courland and Semigallia.| P. Ārends, Kurzemes Hercogu Kapene , Rīga, 1940.| Autor/-in unbekannt Unknown author| [{Image src='https://www.austria-forum.org/cc/images/slim/publicdomain.png' alt='Public domain' align='center' link='https://www.austria-forum.org/cc/public-domain-10.html' target='_blank'}]| Datei:Ferdinands ketlers.jpg
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