Exhibition catalogue published in conjunction with show held at the Bonnefantenmuseum, Maastricht, Netherlands, August 10 - September 21, 1979. Essay by Alexander van Grevenstein. Artists include Servie Janssen, On Kawara, Bas Jan Ader, Carl Andre, Lothar Baumgarten, Didier Bay, Joseph Beuys, Christian Boltanski, Marcel Broodthaers, Daniel Buren, Jan Dibbets, Hamish Fulton, Jochen Gerz, Paul-Armand Gette, Gilbert & George, Douglas Huebler, Toon Leemans, Jean Le Gac, Richard Long, Danny Matthys, Panamarenko, Robert Smithson, and David Tremlett. Includes artists' biographies, exhibition histories, and bibliographies. Illustrated in black-and-white. Text in Dutch and English. Includes Daniel Buren's "D'Une Étage à l'Autre 14 Secondes et 7/10èmes" and addendum sheet loosely laid-in.