Prints 1961 - 1979 Publ. in Ass. with The Williams College Artist-In-Residence-Programm ; Sterling and Francine Clark Art Institute, Williamstown, Mass., April 11 - May 11, 1980 ; The Phillips Collection, Washington D. C., September 16 - October 19 ; The Birmingham Museum of Art, Birmingham, Alabama, November 9 - December 22, 1980 ; The Toledo Museum of Art, Toledo, Ohio, February 14 - March 29, 1981; The Museum of Fine Arts, Boston, Massachusetts, November 21 - January 18, 1982