National Institute on Drug Abuse, NIH, USA, published a monograph on hidden
populations a short time ago. See NIH/NIDA website. Merrill Singer has a
chapter in Book 4, Ethnographers Toolkit, (Schensul and LeCompte) Altamira
press, on this topic. (see Amazon.com or Altamirapress.com). There is
literature on network sampling and recruitment -see journal called
CONNECTIONS and some of the AIDS/HIV literature for these topics. Drug users
of all ages are "hidden populations".
Jean J. Schensul, Ph.D.
Institute for Community Research
Hartford, Ct. USA
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