Six years : The dematerialization of the art object from 1966 to 1972 ; a cross-reference book of information on some esthetic boundaries ; consisting of a bibliography into which are inserted a fragmented text, art works documents, interviews, and symposia, arranged chronologically and focused on so-called conceptual or information or idea art with mentions of such vaguely designated areas as minimal, antiform, systems, earth, or process art, occurring now in the Americas, Europe, England, Australia, and Asia (with occasional political overtones) / edited and annotated by Lucy R. Lippard