Columbia subject headings:
Hallucinations and illusions.
Hallucinogenic drugs.
Huxley, Aldous, 1894-1963.
Visions.
Harvard subject headings:
Hallucinogenic drugs and religious experience
Hallucinogenic drugs--Psychological aspects.
Princeton subject headings:
Hallucinogenic drugs and religious experience.
Hallucinogenic drugs--Psychological aspects.