October 1973 Issue [Wraparound] Matrices Download PDF Adjust Share by Harper’s Staff, This article is only available as a PDF to subscribers. Download PDF Tags 20th century Altered states of consciousness Book reviews Books Claudio Naranjo Jean Houston José Argüelles Miriam Argüelles Reviews Robert E. (Robert Evan) Ornstein Robert E.L. Masters Timothy J. Teyler United States Adjust Share