Columbia subject headings:
Partito socialista italiano--History.
Socialism--Italy--Naples--19th century.
Socialist parties--Italy--Naples--History--19th century.
Working class--Political activity--Italy--Naples--History--19th century.
Harvard subject headings:
Partito socialista italiano--History.
Partito socialista italiano. Sezione napoletana.
Socialism--Italy--Naples--19th century.
Socialism--Italy--Naples--History--19th century.
Socialist parties--Italy--Naples--History--19th century.
Working class--Political activity--Italy--Naples--History--19th century.
Princeton subject headings:
Partito socialista italiano--History.
Socialism--Italy--Naples--History--19th century.
Socialist parties--Italy--Naples--History--19th century.
Working class--Italy--Naples--Political activity--History--19th century.