In Shamanic Teachings of the Condor, Martha Winona Travers, Ph.D. writes about her twenty-two year apprenticeship to the Ecuadorian Kichwa healer Taita Alberto Taxo.
The Lotus and the Bud: Cannabis, Consciousness, and Yoga Practice by Christopher S. Kilham is a wonderful guide to deepening one’s explorations into the expanded states of consciousness offered through yoga practice.