Non-fiction

(1989) The Secret Life of Plants

(1972) Flesh of the Gods: The Ritual Use of Hallucinogens

(1992) Psychedelics Encyclopedia

(1997) The Long Trip: A Prehistory of Psychedelia

(1984) Bolo Bolo

(1993) The Incas and Their Ancestors: The Archaeology of Peru

(1994) Mexico: From the Olmecs to the Aztecs (Ancient Peoples and Places)

(1993) The Maya (Ancient Peoples and Places)

(1989) Cows, Pigs, Wars, and Witches : The Riddles of Culture

(1986) Acid Dreams: The Complete Social History of LSD: The CIA, the Sixties, and Beyond

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