Columbia subject headings:
Iron industry and trade--Africa, Central.
Iron industry and trade--Congo (Democratic Republic)
Steel industry and trade--Africa, Central.
Steel industry and trade--Congo (Democratic Republic)
Harvard subject headings:
Iron industry and trade--Congo (Democratic Republic)
Steel industry and trade--Congo (Democratic Republic)
Princeton subject headings:
Iron industry and trade--Africa, Central.
Iron industry and trade--Congo (Democratic Republic).
Steel industry and trade--Africa, Central.
Steel industry and trade--Congo (Democratic Republic).