Columbia subject headings:
Harvard subject headings:
Anarchists--Italy--Biography
Communists--Italy--Biography
Costa, Andrea, 1851-1910.
Partito socialista italiano--History.
Socialists--Italy--Biography
Princeton subject headings:
Anarchists--Italy--Biography.
Communists--Italy--Biography.
Costa, Andrea, 1851-1910.
Partito socialista italiano--History.
Socialists--Italy--Biography.