Columbia subject headings:
Harvard subject headings:
Albizu Campos, Pedro, 1891-1965--Correspondence.
Nationalism--Puerto Rico--History--Sources.
Political prisoners--Civil rights--United States--Sources.
Princeton subject headings:
Albizu Campos, Pedro, 1891-1965--Correspondence.
Nationalism--Puerto Rico--History--Sources.
Political prisoners--Civil rights--United States--Sources.