Columbia subject headings:
Italy--Politics and government--1870-1914.
Italy--Politics and government--1914-1922.
Partito socialista italiano.
Harvard subject headings:
Italy--Politics and government--1870-1914.
Italy--Politics and government--1914-1922.
Partito socialista italiano.
Princeton subject headings:
Italy--Politics and government--1870-1914.
Italy--Politics and government--1914-1922.
Partito socialista italiano--History.