Columbia subject headings:
Iron industry and trade--France--History.
Metallurgy--France--History.
Harvard subject headings:
Iron industry and trade--France--History--18th century.
Iron industry and trade--France--History--19th century.
Steel industry and trade--France--History--18th century.
Steel industry and trade--France--History--19th century.
Princeton subject headings:
Iron industry and trade--France--History--18th century.
Iron industry and trade--France--History--19th century.
Steel industry and trade--France--History--18th century.
Steel industry and trade--France--History--19th century.