Columbia subject headings:
France--History--Medieval period, 987-1515.
Iron--Metallurgy--History.
Ironwork--France--Normandy--History.
Harvard subject headings:
Blacksmiths--France--Normandy--History.
Iron and steel workers--France--Normandy--History.
Mineral industries--France--Normandy--History.
Miners--France--Normandy--History.
Princeton subject headings:
France--History--Medieval period, 987-1515.
Iron--Metallurgy--History.
Iron-works--France--Normandy--History.