Lippard, Lucy R. Six years : the dematerialization of the art object from 1966 to 1972 / by Lucy R. Lippard [editor] - London : University of California Press, 1997 - xxii, 272p. ill. [b/w]; 22 cm. Includes index ISBN: 0520210131 Subjects--Topical Terms: Conceptual artModern art Dewey Class. No.: 709.04075 LIP