Columbia subject headings:
Europe--Foreign relations--Portugal.
Portugal--Foreign relations--Europe.
Prime ministers--Portugal.
Soares, Mário.
Harvard subject headings:
Europe--Foreign relations--Portugal.
Portugal--Foreign relations--Europe.
Prime ministers--Portugal.
Soares, Mário
Princeton subject headings:
Europe--Foreign relations--Portugal.
Portugal--Foreign relations--Europe.
Prime ministers--Portugal.
Soares, Mário.