Exhibition catalogue in two volumes for show held at the Museum of Fine Arts, Boston, Massachusetts, 1971. First book includes an essay by David Antin, and biographies of the artists in the exhibition, as well as a selected bibliography. Second book includes an errata sheet and black-and-white photographs of the work. Artists in the show included Rachel Bas-Cohain, William Bollinger, Stan Brain, Richard Budelis, Lowry Burgess, Donald Burgy, Christo, François Dallegret, Geny Dignac, Edward Franklin, John Goodyear, Dan Graham, Laura Grisi, Hans Haacke, Newton Harrison, Gerald Hayes, Michael Heizer, Douglas Huebler, Peter Hutchinson, Neil Jenney, Allan Kaprow, Gyula Kosice, Joshua Neustein, Georgette Batlle, Gerard Marx, Dennis Oppenheim, Otto Piene, Ravio Ruusemp, Gary Rieveschl, Charles Ross, Richard Serra, Vera Simons, Robert Smithson, Alan Sonfist, Elizabeth Clark, Christopher Sproat, Marvin Torffield, Uriburu, John Van Saun, Andy Warhol, William Wegman, and Scott Wixon.