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SchwanenburgJh. Schwanenburg in Kleve Ansicht von Osten en The Schwanenburg in Cleves eastern aspect Paul Clemen Hrsg Die Kunstdenkmler der Rheinprovinz Bd Heft Die Kunstdenkmler des Kreises Kleve Schwann Dsseldorf century author PDold Drawings of castles in North RhineWestphalia Schwanenburg Kleve
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