Kriya Yoga Upanishad and The Mystical Upanishads-Kriya Yoga Books
This books reveals the essence of the esoteric science of Yoga. Goswami Kriyananda has added illustrations to this text to make these esoteric teachings more specific and clear, allowing additional information to be gained as the student meditates upon these diagrams.
The Ten Mystical Upanishads contains the mystery and essence of the tetragrammaton, AUMM, which symbolizes the 12 basic states of human consciousness. These are the centers of creative manifestation and also, the esoteric basis for the neutralization of specific karma.