Columbia subject headings:
Balance of payments--United States.
Foreign exchange--United States.
Harvard subject headings:
Balance of payments--United States
Duty-free importation--Law and legislation--United States.
Foreign exchange--United States
Import quotas--Law and legislation--United States.
Legislative hearings.
Tourism--Taxation--Law and legislation.
Princeton subject headings:
Balance of payments--United States.
Foreign exchange--United States.