Columbia subject headings:
Harvard subject headings:
Bronze age--Caucasus--Congresses.
Caucasus--Antiquities--Congresses.
Excavations (Archaeology)--Caucasus--Congresses.
Metallurgy--Caucasus--History--To 1500--Congresses.
Obsidian--Caucasus--History--To 1500--Congresses.
Princeton subject headings:
Bronze age--Caucasus--Congresses.
Caucasus--Antiquities--Congresses.
Excavations (Archaeology)--Caucasus--Congresses.
Metallurgy--Caucasus--History--To 1500--Congresses.
Obsidian--Caucasus--History--To 1500--Congresses.