Columbia subject headings:
Harvard subject headings:
Partido Popular Democrático (Portugal)
Partido Social-Democrata (Portugal)
Political parties--Portugal--History--20th century.
Portugal--Politics and government--1974-
Princeton subject headings:
Partido Popular Democrático (Portugal)
Partido Social-Democrata (Portugal)
Political parties--Portugal--History--20th century.
Portugal--Politics and government--1974-