Columbia subject headings:
Foreign trade regulation--Congresses.
General Agreement on Tariffs and Trade (Organization)
International economic relations--Congresses.
Tariff--Congresses.
Harvard subject headings:
Foreign trade regulation--Periodicals
General Agreement on Tariffs and Trade (Organization)--Periodicals.
International economic relations--Periodicals
Tariff--Law and legislation--Periodicals.
Princeton subject headings:
Tariff--Congresses.
Tariff--Law and legislation.