Columbia subject headings:
Drug addicts--History.
Heroin abuse.
Morphine abuse.
Opium abuse--United States--History.
Opium trade--Law and legislation--United States--History.
Opium--Therapeutic use--History.
Harvard subject headings:
Drug addicts--History.
Heroin abuse.
Morphine abuse.
Opium abuse--United States--History.
Opium trade--Law and legislation--United States--History.
Opium--Therapeutic use--History.
Princeton subject headings:
Drug addicts--History.
Heroin abuse.
Morphine abuse.
Opium abuse--United States--History.
Opium trade--Law and legislation--United States--History.
Opium--Therapeutic use--History.