Columbia subject headings:
Portugal--History--1910-1974.
Portugal--Politics and government--1910-1974.
Portugal--Social life and customs--20th century.
Harvard subject headings:
Portugal--History--1910-1974.
Portugal--Politics and government--1910-1974.
Portugal--Social life and customs--20th century.
Princeton subject headings:
History, Modern--20th century.
Portugal--History--20th century.
Portugal--Politics and government--1933-1974.
Salazar, António de Oliveira, 1889-1970.