Columbia subject headings:
Sanitation--Italy--Rome.
Harvard subject headings:
Refuse collection--Italy--Rome--History.
Sanitation workers--Italy--Rome--History.
Sanitation--Italy--Rome--History.
Street cleaning--Italy--Rome--History.
Princeton subject headings:
Refuse collection--Italy--Rome--History.
Sanitation workers--Italy--Rome--History.
Sanitation--Italy--Rome--History.