Columbia subject headings:
East Asia--History.
Harbors--China--History.
Harbors--Japan--History.
Harbors--Korea--History.
Harvard subject headings:
East Asia--History.
Harbors--China--History.
Harbors--Japan--History.
Harbors--Korea--History.
Princeton subject headings:
East Asia--Foreign economic relations.
Harbors--East Asia.
Harbors--Economic aspects--East Asia.
Strategic planning--East Asia.