Columbia subject headings:
Political prisoners--United States.
Revolutionaries--Puerto Rico.
Harvard subject headings:
Cancel Miranda, Rafael, 1929-.
Collazo, Oscar, 1914-
Figueroa Cordero, Andrés, 1923-1979.
Flores, Irving, 1926-
Nationalism--Puerto Rico
Political prisoners--Puerto Rico--Biography.
Puerto Rico--Politics and government--1898-1952.
Revolutionaries--Puerto Rico--Biography.
Princeton subject headings: