Excerpted from Psychedelic Medicine:

Observations from 4,000 LSD Sessions

Stanislav Grof, MD, PhD
July 21, 2015

Stanislav Grof, MD, PhD, is author of Realms of the Human Unconscious, LSD Psychotherapy, Beyond Death, The Adventure of Self Discovery, Beyond the Brain, Psychology of the Future, The Cosmic Game, Healing Our Deepest Wounds, and Modern Consciousness Research and the Understanding of Art.

http://www.hopedance.org/home/awakenings/3128-observations-from-4-000-lsd-sessions