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2. The Birth of Heroin and the Demonisation of the Dope Fiend;Metzger,1998
3. Designer Drug Directory;Valter,1998
4. Drug Misuse in the NW of England 2000, Public Health Section of Liverpool and Manchester Universities and Drugs Misuse Research Unit, University of Manchester, 2000 (email: petra.meier@man.ac.uk).