Columbia subject headings:
Heroin abuse--Government policy--Great Britain.
Heroin abuse--Government policy--United States.
Heroin--Therapeutic use.
Harvard subject headings:
Heroin abuse--Government policy--Great Britain.
Heroin abuse--Government policy--United States.
Heroin--Therapeutic use.
Princeton subject headings:
Heroin abuse--Government policy--Great Britain.
Heroin abuse--Government policy--United States.
Heroin--Therapeutic use.