April 1969 issue of Studio International. Cover designed by Donald Judd. Edited by Peter Townsend. Artists in the issue include Donald Judd, Dan Flavin, Carl Andre, Robert Smithson, and Sol LeWitt. Written contributions by Dore Ashton, Edward Lucie-Smith, Barbara Reise, Jonathan Bentall, Charles Harrison, Joseph Masheck, Paul Overy, and Elizabeth Deighton. Printed in black-and-white.