Sacred Plants

Bennett, Chris
Green Gold the Tree of Life: Marijuana in Magic and Religion

Roberts, Thomas B. & Paula Jo Hruby
Religion and Psychoactive Sacraments: A Bibliographic Guide

Martin Gray

Martin Gray is a cultural anthropologist, writer and photographer specializing in the study of pilgrimage traditions and sacred sites around the world. During a 40 year period he has visited more than 2000 pilgrimage places in 165 countries. The World Pilgrimage Guide at sacredsites.com is the most comprehensive source of information on this subject.