Columbia subject headings:
Harvard subject headings:
Africa--Relations--Portugal.
Aginter Press (News agency)--History.
Espionage--Portugal--History--20th century.
News agencies--Portugal--History.
Portugal--Relations--Africa.
Princeton subject headings:
Anti-communist movements--Portugal--History--20th century.
Espionage--Portugal--History--20th century.
Portugal--Politics and government--1933-1974.