1970. Letter (page 5/7) from Robert Filliou to Georg Jappe. Ref. The Vocational Game. Strategy: Get Arts.
1970. Installation of Konrad Klapheck and Erwin Heerich works. Strategy: Get Arts. Edinburgh College of Art.
1970. Letter (page 2/2) from Demarco to Willi Fleischer, Cultural Officer of the City of Dusseldorf. Ref. Strategy: Get Arts.