1. The National Survey on Drug Abuse, Main Findings 1977;Abelson,1977
2. Patterns of nonopiate/polydrug abuse: Findings of a national collaborative research project;Benvenuto,1975
3. Polydrug abuse—Status report on the federal effort;Bourne,1975
4. Patterns of drug use among marihuana smokers;Carlin;JAMA,1971
5. Alcohol use and alcohol problems among U.S. adults: Results of the 1979 national survey;Clark,1982