Dieter Honisch, Wim A. L. Beeren, Verborgene Strukturen, Museum Folkwang Essen, 1969. Soft cover, 23.9 x 15.9 cm, 88 p 1st edition. Exhibition catalogue published in conjunction with show held May 9 - June 22, 1969.
Text by Dieter Honisch and Wim A. L. Beeren. Artists in the exhibition include Carl Andre, Giovanni Anselmo, Joseph Beuys, Boezem, Bill Bollinger, Pier Paolo Calzolari, Jan Dibbets, Ger van Elk, Rafael Ferrer, Barry Flanagan, Mike Heizer, Douglas Huebler, Paolo Icaro, Neil Jenney, Olle Kðks, Jannis Kounellis, Richard Long, Walter De Maria, Mario Merz, Marisa Merz, Robert Morris, Bruce Nauman, Dennis Oppenheim, Panamarenko, Emilio Prini, Reiner Ruthenbeck, Robert Ryman, Alan Saret, Richard Serra, Robert Smithson, Keith Sonnier, Frank Lincoln Viner, Lawrence Weiner, and Gilberto Zorio. Includes bibliography, and a biography for each individual artist. Printed in black-and-white. Text in German." A rare and historical catalogue. The exhibition was presented earlier titled "Op Losse Schroeve" in Stedelijk Museum Amsterdam 1969.

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