Columbia subject headings:
Lombardy (Italy)--Politics and government.
Partito operaio italiano--History.
Working class--Political activity--Italy--Lombardy.
Harvard subject headings:
Lombardy (Italy)--Politics and government.
Partito operaio italiano--History.
Working class--Italy--Lombardy--Political activity.
Working class--Political activity--Italy--Lombardy.
Princeton subject headings:
Lombardy (Italy)--Politics and government.
Partito operaio italiano--History.
Working class--Italy--Lombardy--Political activity.