Deutsch: Ralf van Bühren nach einer Kunstgeschichte-Vorlesung für Studenten der Kommunikationsfakultät (Palazzo dell’Apollinare, Päpstliche Universität Santa Croce, Rom)
English: Ralf van Bühren after lecturing art history to students of the Faculty of Communication (Palazzo dell'Apollinare, Pontifical University of Santa Croce, Rome).
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