Columbia subject headings:
Harbors--United States--Finance--Statistics.
Marine terminals--United States--Finance--Statistics.
Harvard subject headings:
Harbors--United States--Finance--Statistics.
Harbors--United States--Finance.
Marine terminals--United States--Finance--Statistics.
Marine terminals--United States--Finance.
Princeton subject headings:
Harbors--United States--Finance.
Marine terminals--United States--Finance.