Columbia subject headings:
Drug abuse surveys--United States.
Drugs of abuse--United States--Statistics.
Substance abuse--United States--Statistics.
Harvard subject headings:
Drug abuse surveys--United States.
Drugs of abuse--United States--Statistics.
Substance abuse--United States--Statistics.
Princeton subject headings:
Drug abuse surveys--United States.
Drugs of abuse--United States--Statistics.
Statistics.
Substance abuse--United States--Statistics.