Columbia subject headings:
Commerce--History--To 500--Congresses.
Economic history--To 500--Congresses.
Mediterranean Region--Commerce--Congresses.
Harvard subject headings:
Commerce--History--To 500--Congresses.
Economic history--To 500--Congresses.
Mediterranean Region--Commerce--Congresses.
Princeton subject headings:
Commerce--History--To 500--Congresses.
Economic history--To 500--Congresses.
Mediterranean Region--Commerce--Congresses.