Columbia subject headings:
Harvard subject headings:
Congo (Brazzaville)--Economic conditions--21st century.
Freight and freightage--Africa.
Freight and freightage--Congo (Brazzaville).
Shipping--Congo (Brazzaville)
Princeton subject headings:
Congo (Democratic Republic)--Economic conditions--21st century.
Freight and freightage--Congo (Democratic Republic).
Shipping--Congo (Democratic Republic).