1. 1. US Department ofHealthAndHumanServices(1991 ) Drug abuse and drug abuse research, The Third Triennial Report to Congress, DHHS Pub. No. (ADM)91-1704.
2. 2. NationalInstitute onDrugAbuse(1991 ) National Household Survey on Drug Abuse: population estimates 1991, DHSS Pub. No. (ADM)92-1887.
3. 3. NationalInstitute onDrugAbuse(1983 ) National Household Survey on Drug Abuse: main findings 1982, DHHS Pub. No, (ADM)83-1263.
4. 4. Cisin, H. Ira, Miller, and D. Judith(1984 ) Drug use onset and diffusion: Jour measures in selected birth cohorts, unpublished report for the National Institute on Drug Abuse under contract 271-81-1702.
5. 5. B. V. Shah(1981 ) SESUDAAN: Standard Errors Program for Computing of Standardized Rates from Sample Survey Data, Research Triangle Institute, Research Triangle Park, NC, RTI/5250/00-01S.