Columbia subject headings:
Transportation--Italy--Veneto--History--Congresses.
Harvard subject headings:
Transportation--Italy--Veneto--History--Congresses.
Princeton subject headings:
Roads--Italy--Veneto--History--To 1500--Congresses.
Transportation--Italy--Veneto--History--To 1500--Congresses.
Waterways--Italy--Veneto--History--To 1500--Congresses.