Darkness visible: the prints of John Martin; [publ. on the occasion of an exhibition at the Sterlin and Francine Clark Art Institute, Williamstown, Massachusetts, 27 September to 30 November 1986; which will travel to the Helen Foresman Spencer Museum of Art, Univ. of Kansas, Lawrence, 18 January to 7 March 1987; and to the Allen Memorial Art Museum, Oberlin College, Oberlin, Ohio, 5 April to 31 May 1987]