Columbia subject headings:
Azores--Foreign relations--United States.
Azores--History--Autonomy and independence movements.
Portugal--Foreign relations--United States.
United States--Foreign relations--Azores.
United States--Foreign relations--Portugal.
Harvard subject headings:
Princeton subject headings:
Azores--Foreign relations--United States.
Azores--History--Autonomy and independence movements.
Portugal--Foreign relations--United States.
United States--Foreign relations--Azores.
United States--Foreign relations--Portugal.