Columbia subject headings:
Roads--Italy.
Streets--Italy--Milan.
Urban transportation--Italy--Milan.
Harvard subject headings:
Europe--Commerce--Italy--Milan--History.
Milan (Italy)--Commerce--Europe--History.
Roads--Europe--History.
Roads--Italy--Milan--History.
Trade routes--Europe--History.
Trade routes--Italy--Milan--History.
Transportation--Europe--Costs--History.
Transportation--Italy--Milan--Costs--History.
Princeton subject headings: