Columbia subject headings:
Foreign trade regulation--United States--Indexes.
United States--Foreign relations--Law and legislation--Indexes.
United States--Foreign relations--Treaties--Indexes.
Harvard subject headings:
Foreign trade regulation--United States--Indexes.
United States--Foreign relations--Treaties--Indexes.
United States. Laws, etc. (United States statutes at large)--Indexes.
Princeton subject headings:
Foreign trade regulation--United States--Indexes.
Foreign trade regulation--United States.
Indexes.
International law--United States--Indexes.
International law--United States.
United States--Foreign relations--Law and legislation--Indexes.
United States--Foreign relations--Law and legislation.
United States--Foreign relations--Treaties--Indexes.