Columbia subject headings:
Trade associations--Italy--Naples (Province)--History--20th century.
Unione regionale industriale (Naples, Italy)--History.
Harvard subject headings:
Trade associations--Italy--Naples (Province)--History--20th century.
Unione regionale industriale (Naples, Italy)--History.
Princeton subject headings:
Industrial relations--Italy--Naples--History--20th century.
Industries--Italy--Naples--History--20th century.