Columbia subject headings:
Portugal--Foreign relations--United States.
Portugal--Politics and government--1974-
United States--Foreign relations--Portugal.
Harvard subject headings:
Portugal--Foreign relations--United States.
Portugal--Politics and government--1974-
United States--Foreign relations--Portugal.
Princeton subject headings:
Portugal--Foreign relations--United States.
Portugal--Politics and government--1974-
United States--Foreign relations--Portugal.