Columbia subject headings:
Colombia--Foreign relations--United States.
Drug control--Colombia.
Drug traffic--Colombia.
Heroin industry--Colombia.
United States--Foreign relations--Colombia.
Harvard subject headings:
Colombia--Foreign relations--United States.
Drug control--Colombia
Drug traffic--Colombia.
Drug traffic--United States
Heroin industry--Colombia.
Heroin--United States.
United States--Foreign relations--Colombia.
Princeton subject headings:
Colombia--Foreign relations--United States.
Drug control--Colombia.
Drug traffic--Colombia.
Heroin industry--Colombia.
United States--Foreign relations--Colombia.