September 1971 issue of the German art periodical Interfunktionen. Cover by Bruce Nauman witith contributions by Nauman, Dennis Oppenheim, Vito Acconci, Arnulf Rainer, Joseph Beuys, Terry Fox, Friedrich Wolfram Heubach, Hamish Fulton, Heinz Frank, Michael Heizer, Johannes Stüttgen, Roger Welsh, Robert [Bob] Morris, Rob Can, Richard Budelis, Peter Weibel. Edited by Friedrich Wolfram Heubach. Text in English and German.