Columbia subject headings:
Harvard subject headings:
Nationalism--Puerto Rico--History--20th century
Political violence--Puerto Rico--History.
Puerto Rico--Politics and government--1898-1952.
Princeton subject headings:
National liberation movements--Puerto Rico.
Nationalism--Puerto Rico.
Political violence--Puerto Rico--1898-1952.
Puerto Rico--History--1898-1952.
Puerto Rico--Politics and government--1898-1952.