Columbia subject headings:
Mediterranean Region--Commerce--History--Congresses.
Mediterranean Region--Commercial policy--History--Congresses.
Middle East--Commerce--History--Congresses.
Middle East--Commercial policy--History--Congresses.
Harvard subject headings:
Mediterranean Region--Commerce--History--Congresses.
Mediterranean Region--Commercial policy--History--Congresses.
Mediterranean Region--History--To 476--Congresses.
Middle East--Commerce--History--Congresses.
Middle East--Commercial policy--History--Congresses.
Middle East--History--To 622--Congresses.
Princeton subject headings: