Author: Ouspensky, P.D.
Title: TERTIUM ORGANUM: A Key to the Enigmas of the World.
Description: NY: Alfred A. Knopf, 1944. Second edition, revised and augmented. A Fine Cloth Copy in dust jacket. Fold out chart in rear on the four forms of consciousness. 336 pages. Royal octavo.

Keywords: Ouspensky Gurdjieff Fourth Way