Ouspensky, P. D. Tertium Organum: Third Canon of Thought; Translated from Russian by Bessaraboff, Nicholas and Bragdon, Claude. - - London Routledge & Kegan Paul 1957 - Xv, 306 pgs.; 24 cms. B ISBN: Subjects--Topical Terms: Other Philosophical Systems. Dewey Class. No.: 149.3 Ous/Ter