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Briefe Theo van Doesburg . Theo van Doesburg Kunsthalle Nrnberg Marientor April bis Juni Biennale Nrnberg Konstruktive Kunst Elemente und Prinzipien Kunsthalle Basel August bis September Ausstellungskatalog Eindhoven ZIBibliothek creator Theo van Doesburg PDold De book leaflet Letters by Theo van Doesburg