Columbia subject headings:
Harvard subject headings:
Apennines (Italy)--Commerce--History--Congresses.
Commerce--History--Congresses.
Freight and freightage--Italy--Apennines--History--Congresses.
Markets--Italy--Apennines--History--Congresses.
Merchants--Italy--Apennines--History--Congresses.
Princeton subject headings:
Apennines (Italy)--Commerce--History--Congresses.
Freight and freightage--Italy--Apennines--History--Congresses.
Markets--Italy--Apennines--History--Congresses.