Columbia subject headings:
Drug addiction--Germany--History.
Drug addiction--United States--History.
Drugs--Germany--History.
Drugs--United States--History.
Harvard subject headings:
Drug addiction--Germany--History.
Drug addiction--United States--History.
Drugs--Germany--History.
Drugs--United States--History.
Princeton subject headings:
Drug addiction--Germany--History.
Drug addiction--United States--History.
Drugs--Germany--History.
Drugs--United States--History.