Columbia subject headings:
Harbors--Law and legislation--Southeast Asia--History.
Harbors--Management--Southeast Asia--History.
Southeast Asia--Commerce--History.
Harvard subject headings:
Harbors--Southeast Asia--History.
Shipping--Southeast Asia--History.
Southeast Asia--Commerce--History.
Southeast Asia--Economic policy
Southeast Asia--Politics and government.
Princeton subject headings:
Harbors--Asia, Southeastern--History.
Shipping--Asia, Southeastern--History.
Southeast Asia--Commerce--History.
Southeast Asia--Economic policy.
Southeast Asia--Politics and government.