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Cannabis in Africa : a survey of its distribution in Africa, and a study of cannabis use and users in multi-etnic South Africa
Du Toit, Brian M., (1980)
The New social drug : Cultural, medical, and legal perspectives on marijuana
Smith, David E., (1970)
Cannabis use and dependence : public health and public policy
Hall, Wayne, (2003)
Pot politics : marijuana and the costs of prohibition
Earleywine, Mitchell, (2007)