Columbia subject headings:
Censorship--Portugal--History--20th century.
Portugal--Cultural policy.
Portugal--Politics and government--1933-1974.
Prohibited books--Portugal.
Harvard subject headings:
Censorship--Portugal--History--20th century.
Princeton subject headings:
Censorship--Portugal--History--20th century.
Portugal--Cultural policy.
Portugal--Politics and government--1933-1974.
Prohibited books--Portugal.