Columbia subject headings:
Naval art and science--Rome--History.
Navigation--Rome--History.
Ocean and civilization.
Rome--Civilization.
Rome--History, Naval.
Harvard subject headings:
Navigation--Rome.
Rome--Civilization
Seas--Social aspects--Rome.
Princeton subject headings:
Mediterranean Region--History, Naval.
Navigation--Rome--History.
Rome--Civilization.
Rome--Commerce--History.
Rome--History, Naval.
Seafaring life--Rome--History.