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http://school.eb.com/levels/high/article/38956
http://www.camh.ca/en/education/about/camh_publications/Documents/Flat_PDFs/dyk_hallucinogens.pdf
http://science.howstuffworks.com/magic-mushroom.htm
http://www.drugabuse.gov/publications/research-reports/hallucinogens-dissociative-drugs/what-are-hallucinogens
http://www.drugabuse.gov/publications/drugfacts/hallucinogens-lsd-peyote-psilocybin-pcphttp://www.psychologytoday.com/conditions/hallucinogens