Philosophia Ultima
This book is currently on back order.
Talks on the Mandkukya Upanishad
These discourses focus on the see mantra aum, the imperishable sound that is the seed of all that exists.
"There is no way to go beyond the Mandukaya Upanishad, its message is eternal and represents the ultimate in human consciousness." –Osho
Hardcover edition by Rebel