Columbia subject headings:
Commercial law--Congresses.
International economic relations--Congresses.
Tariff--Law and legislation--Congresses.
Harvard subject headings:
Commercial law--Congresses
International economic relations--Congresses
Tariff--Law and legislation--Congresses.
Princeton subject headings:
Commercial law--Congresses.
International economic relations--Congresses.
Tariff--Law and legislation--Congresses.