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Olsson, B, ed. O'Hare, Aileen and Hartnoll, Richard and Avico, A and Ingold, FR and Lange, K and Lenke, Leif (1987) Multi-city study of drug misuse in Amsterdam, Dublin, Hamburg, London, Paris, Rome and Stockholm. final report. section 2: technical report on indicators of drug misuse in the seven cities and recommendations for future monitoring. Strasbourg: Council of Europe, Co-operation Group to Combat Drug Abuse and Illicit Trafficking in Drugs (Pompidou Group).

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