Columbia subject headings:
Puerto Rico--Politics and government.
Puerto Rico--Relations--United States.
Student movements--Puerto Rico.
United States--Relations--Puerto Rico.
Working class--Puerto Rico.
Harvard subject headings:
Essays
Movimiento Pro Independencia de Puerto Rico--History.
Partido Socialista Puertorriqueño--History.
Puerto Rico--Politics and government--1898-1952
Puerto Rico--Relations--United States
Student movements--Puerto Rico--History--20th century.
United States--Relations--Puerto Rico
Princeton subject headings:
Puerto Rico--Politics and government.
Puerto Rico--Relations--United States.
Student movements--Puerto Rico.
United States--Relations--Puerto Rico.
Working class--Puerto Rico.