Columbia subject headings:
Metallurgy--France--Morvan--History.
Mines and mineral resources--France--Morvan--History.
Morvan (France)--Antiquities.
Harvard subject headings:
Iron mines and mining--France--Nièvre--History.
Iron mines and mining--France--Yonne--History.
Iron--Metallurgy--History
Nièvre (France)--Antiquities.
Yonne (France)--Antiquities.
Princeton subject headings:
Iron mines and mining--France--Morvan Region--History.
Metallurgy--France--Morvan Region--History.