Columbia subject headings:
Political parties--Puerto Rico.
Puerto Rico--Politics and government--1952-1998.
Puerto Rico--Social conditions.
Harvard subject headings:
Political parties--Puerto Rico
Puerto Rico--Politics and government--1952-
Puerto Rico--Politics and government--1952-1998.
Puerto Rico--Social conditions.
Princeton subject headings:
Political parties--Puerto Rico.
Puerto Rico--Politics and government--1952-1998.
Puerto Rico--Social conditions.