Columbia subject headings:
Lo Sardo, Francesco--Correspondence.
Political prisoners--Italy--Correspondence.
Socialists--Italy--Correspondence.
Harvard subject headings:
Lo Sardo, Francesco--Correspondence.
Political prisoners--Italy--Correspondence.
Socialists--Italy--Correspondence
Princeton subject headings:
Lo Sardo, Francesco--Correspondence.
Political prisoners--Italy--Correspondence.
Socialists--Italy--Correspondence.