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The Way of the Psychonaut, Stan Grof
https://www.amzn.com/dp/B093QGH561
https://www.amzn.com/dp/B093QHZDJS
Holotropic Breathwork, Stan Grof
https://www.amzn.com/dp/B0CC349CFP
The Survival Imperative, Ervin Laszlo
https://www.amzn.com/dp/B0BZ2PC97G