The Doors of Perception and Heaven and Hell

Opening the Doors of Perception: The Key to Cosmic Awareness

Anthony Peake

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The Joyous Cosmology: Adventures in the Chemistry of Consciousness

Alan W. Watts

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LSD: Doorway to the Numinous: The Groundbreaking Psychedelic Research into Realms of the Human Unconscious

Stanislav Grof M.D.

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