The Sidney and Harriet Janis Collection, The Museum of Modern Art, New York, New York, January 17 – March 4, 1968; Minneapolis Institute of Arts, Minneapolis, Minnesota, May 15 – July 28, 1968; Art Museum, Portland, Maine, September 13 – October 13, 1968; Pasadena Art Museum, Pasadena, California, November 12 – December 15, 1968; San Francisco Museum of Modern Art, San Francisco, California, January 13 – February 16, 1969; Seattle Art Museum, Seattle, Washington, March 14 – April 13, 1969; Dallas Museum of Fine Arts, Dallas, Texas, May 14 – June 8, 1969; Albright-Knox Art Gallery, Buffalo, New York, September 15 – October 19, 1969; The Cleveland Museum of Art, Cleveland, Ohio, November 18, 1969 – January 4, 1970; Kunsthalle, Basel, Switzerland, February 28 – March 30, 1970; Institute of Contemporary Arts, London, England, May 1 – May 31, 1970; Akademie der Künste, Berlin, Germany, June 12 – August 2, 1970; Kunsthalle, Nürnberg, Germany, September 11 – October 25, 1970; Würtembergischer Kunstverein, Stuttgart, Germany, November 11 – December 27, 1970; Palais des Beaux-Arts, Brussels, Belgium, January 7 – February 11, 1971; Kuntshalle, Cologne, Germany, March 5