Columbia subject headings:
Chemical workers--Labor unions--Italy--Marghera--History--20th century.
Labor disputes--Italy--Marghera--History--20th century.
Harvard subject headings:
Chemical workers--Labor unions--Italy--Marghera--History--20th century.
Labor disputes--Italy--Marghera--History--20th century.
Princeton subject headings:
Chemical workers--Labor unions--Italy--Marghera--History--20th century.
Labor disputes--Italy--Marghera--History--20th century.