Columbia subject headings:
Drug abuse surveys--United States.
Drugs of abuse--United States--Statistics.
National Household Survey on Drug Abuse (U.S.)
Substance abuse--United States--Statistics.
Harvard subject headings:
Drug abuse surveys--United States--Mathematical models.
Drug abuse surveys--United States--Statistical methods.
National Household Survey on Drug Abuse (U.S.)
Princeton subject headings:
Drug abuse surveys--United States--Mathematical models.
Drug abuse surveys--United States--Statistical methods.