Nomination techniques in the study of largely invisible groups: Opiate users not at drug dependence clinics von Blumberg, Herbert H., Dronfield, B.Elizabeth

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British Opiate Users: I. People Approaching London Drug Treatment Centres von Herbert, H. Blumberg, Cohen, S. Daryl, Dronfield, B. Elizabeth, Elizabeth, A. Mordecai, Roberts, J. Colin, Hawks, David

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British Opiate Users: II. Differences between Those Given an Opiate Script and Those Not Given One von Blumberg, Herbert H., Cohen, S. Daryl, Dronfield, B. Elizabeth, Mordecai, Elizabeth A., Roberts, J. Colin, Hawks, David

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