Columbia subject headings:
Free ports and zones--Congresses.
Monetary unions--Congresses.
Harvard subject headings:
Banks and banking, International--Congresses.
Foreign exchange--Congresses
Free ports and zones--Congresses.
International economic relations--Congresses
Monetary unions--Congresses.
Princeton subject headings:
Banks and banking, International.
Foreign exchange.
Free ports and zones.
International economic relations.