Columbia subject headings:
Drug control--International cooperation--Congresses.
Drug control--United States--Congresses.
Drug traffic--Congresses.
Harvard subject headings:
Drug control--International cooperation--Congresses.
Drug control--United States--Congresses
Drug traffic--Congresses.
Princeton subject headings:
Drug control--International cooperation--Congresses.
Drug control--United States--Congresses.
Drug traffic--Congresses.