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| | https://digital.belvedere.at/objects/2830/professor-ernst-diez| Richard Gerstl| [{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:Richard Gerstl - Professor Ernst Diez - 4036 - Österreichische Galerie Belvedere.jpg
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