Columbia subject headings:
Cuba--Foreign economic relations.
Cuba--Foreign relations--United States.
Economic sanctions, American--Cuba.
Travel restrictions--United States.
United States--Foreign relations--Cuba.
Harvard subject headings:
Cuba--Foreign economic relations.
Cuba--Foreign relations--United States.
Economic sanctions, American--Cuba.
Travel restrictions--United States
United States--Foreign relations--Cuba.
Princeton subject headings:
Cuba--Foreign economic relations.
Cuba--Foreign relations--United States.
Economic sanctions, American--Cuba.
Travel restrictions--United States.
United States--Foreign relations--Cuba.