Columbia subject headings:
Harvard subject headings:
Chemical workers--Labor unions--Italy--History.
Collective bargaining--Chemical industry--Italy--History.
Collective labor agreements--Chemical industry--Italy--History--20th century.
Collective labor agreements--Chemical industry--Italy--History--21st century.
Princeton subject headings:
Chemical workers--Legal status, laws, etc.--Italy--History.
Collective labor agreements--Chemical industry--Italy--History--20th century.
Collective labor agreements--Chemical industry--Italy--History--21st century.