Columbia subject headings:
Buddhism--South Asia--History.
Coastal archaeology--South Asia--History.
Navigation--South Asia--History.
South Asia--Commerce--History.
Harvard subject headings:
Buddhism--South Asia--History.
Navigation--South Asia--History.
South Asia--Commerce--History.
Underwater archaeology--South Asia.
Princeton subject headings:
Buddhism--South Asia--History.
Coastal archaeology--South Asia--History.
Navigation--South Asia--History.
South Asia--Commerce--History.