Columbia subject headings:
Red Sea Region--Commerce--Rome.
Rome--Commerce--Red Sea Region.
Rome--Economic policy.
Harvard subject headings:
Middle East--Commerce--Rome.
Red Sea Region--Commerce--Rome.
Rome--Commerce--Middle East.
Rome--Commerce--Red Sea Region.
Rome--Economic policy.
Princeton subject headings:
Red Sea Region--Commerce--Rome.
Rome--Commerce--Red Sea Region.
Rome--Economic policy.