Columbia subject headings:
Harvard subject headings:
Business information services--Use studies.
Business intelligence--History--20th century.
Iron industry and trade--Belgium--History--20th century.
Iron industry and trade--France--History--20th century.
Iron industry and trade--Germany--History--20th century.
Iron industry and trade--Luxembourg--History--20th century.
Steel industry and trade--Belgium--History--20th century.
Steel industry and trade--France--History--20th century.
Steel industry and trade--Germany--History--20th century.
Steel industry and trade--Luxembourg--History--20th century.
Princeton subject headings:
Business information services--Use studies.
Business intelligence--History--20th century.
Iron industry and trade--Belgium--History--20th century.
Iron industry and trade--France--History--20th century.
Iron industry and trade--Germany--History--20th century.
Iron industry and trade--Luxembourg--History--20th century.
Steel industry and trade--Belgium--History--20th century.
Steel industry and trade--France--History--20th century.
Steel industry and trade--Germany--History--20th century.
Steel industry and trade--Luxembourg--History--20th century.