Columbia subject headings:
Italy--Politics and government--1870---Sources.
Partito socialista italiano--Congresses--History--Sources.
Socialism--Italy--History--Sources.
Harvard subject headings:
Italy--Politics and government--1870---Sources.
Partito socialista italiano--Congresses--History--Sources.
Socialism--Italy--History--Sources.
Socialism--Italy--Sources.
Princeton subject headings:
Italy--Politics and government--1870---Sources.
Partito socialista italiano--Congresses--History--Sources.
Socialism--Italy--History--Sources.