Columbia subject headings:
History, Ancient.
Mediterranean Region--Commerce--History.
Merchant marine--Mediterranean Region--History.
Rome--Commerce--History.
Shipping--Mediterranean Region--History.
Shipping--Rome--History.
Trade routes--Rome--History.
Underwater archaeology--Mediterranean Region.
Harvard subject headings:
History, Ancient
Mediterranean Region--Commerce--History.
Merchant marine--Mediterranean Region--History.
Rome--Commerce--History.
Shipping--Mediterranean Region--History.
Shipping--Rome--History.
Trade routes--Rome--History.
Underwater archaeology--Mediterranean Region.
Princeton subject headings:
History, Ancient.
Mediterranean Region--Commerce--History.
Merchant marine--Mediterranean Region--History.
Rome--Commerce--History.
Shipping--Mediterranean Region--History.
Shipping--Rome--History.
Trade routes--Rome--History.
Underwater archaeology--Mediterranean Region.