New York/Torino: Castelli/Sperone, 1973
40.8 X 29cm. 56pp. Profusely illustrated throughout. Self-tabloid. First edition of this expansive conceptual work. Content of response contributions by 50 participating artists including Elanor Antin, John Baldessari, Robert Barry, Bernd & Hilla Becher, Alighiero e Boetti, Stanley Brouwn, Daniel Buren, Robert Cumming, Hanne Darboven, Jan Dibbets, Gilbert & George, Hans Haacke, Sol Lewitt, Lucy Lippard, Adrian Piper, Ed Ruscha, Lawrence Weiner, et. al. One of 2,000 examples issued. A fine copy of this imperative document. Increasingly scarce.