Columbia subject headings:
Dalmine Siderca (Firm)
Syndicalism--Italy--Bergamo--History.
Unione italiana del lavoro--History.
Harvard subject headings:
Dalmine (Firm)
Dalmine Siderca (Firm)
Syndicalism--Italy--Bergamo--History.
Unione italiana del lavoro--History.
Princeton subject headings:
Dalmine (Firm)
Syndicalism--Italy--Bergamo--History.
Unione italiana del lavoro--History.