Columbia subject headings:
Harvard subject headings:
Costa Rica--Politics and government--20th century.
Partido Liberación Nacional--History.
Political parties--Costa Rica--History--20th century.
Socialism--Costa Rica--20th century.
Socialism--Costa Rica--History--20th century.
Princeton subject headings:
Costa Rica--Politics and government--1948-1986.
Partido Liberación Nacional.
Political parties--Costa Rica.
Social movements--Costa Rica.