Columbia subject headings:
Colombia--Relations--United States.
Drug control--Colombia.
Drug traffic--Colombia.
Helicopters--Colombia--Purchasing.
United States--Relations--Colombia.
Harvard subject headings:
Colombia--Relations--United States.
Drug control--Colombia
Drug traffic--Colombia.
Helicopters--Colombia--Purchasing.
United States--Relations--Colombia.
Princeton subject headings:
Colombia--Relations--United States.
Drug control--Colombia.
Drug traffic--Colombia.
Helicopters--Colombia--Purchasing.
United States--Relations--Colombia.