Columbia subject headings:
Harvard subject headings:
Excavations (Archaeology)--Congresses
Metal-work, Prehistoric--Congresses.
Metallurgy in archaeology--Congresses.
Metallurgy--History--Congresses.
Metallurgy--History.
Metals--History.
Princeton subject headings:
Bronze age--Congresses.
Copper age--Congresses.
Iron age.
Metallurgy--History--Congresses.
Metals--History--Congresses.