Columbia subject headings:
France--History--Medieval period, 987-1515--Congresses.
Metallurgy--France--History--Congresses.
Mines and mineral resources--France--History--Congresses.
Harvard subject headings:
France--History--Medieval period, 987-1515--Congresses.
Metallurgy--France--History--Congresses.
Mines and mineral resources--France--History--Congresses.
Princeton subject headings:
Metallurgy--France--History--Congresses.
Mineral industries--France--History--Congresses.