G.I. Gurdjieff/Thomas de Hartmann. Music for the Piano: Definitive Edition in Four Volumes.
Published by Schott Musik International, Mainz, German.

Volume 1: Asian Songs and Rhythms (ED 7841), 1996
Volume II: Music of the Sayyids and the Dervishes, (ED 7842)
Volume III: Hymns, Prayers and Rituals (Ed7843)
Volume IV: Hymns from a Great Temple and other Selected Works, in preparation.