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Ed Rosenthal is recognized worldwide as a leading authority on marijuana. In his more than 30 years as the “guru of ganja,” he has written or edited more than a dozen books about marijuana cultivation and social policy that cumulatively have sold more than one million copies. One of his books on marijuana cultivation is the only book of its type to be reviewed by the New York Times. He was one of the original American writers to travel to Holland, bringing European knowledge and sophistication a