Columbia subject headings:
Harvard subject headings:
Bronze age--Balkan Peninsula--Congresses.
Excavations (Archaeology)--Balkan Peninsula--Congresses.
Fortification, Prehistoric--Balkan Peninsula--Congresses.
Fortification--Balkan Peninsula--History--Congresses.
Fortification--Germany--History--Congresses.
Human settlements--Balkan Peninsula--History--Congresses.
Iron age--Balkan Peninsula--Congresses.
Princeton subject headings:
Bronze age--Balkan Peninsula--Congresses.
Excavations (Archaeology)--Balkan Peninsula--Congresses.
Fortification, Prehistoric--Balkan Peninsula--Congresses.
Fortification--Balkan Peninsula--History--Congresses.
Fortification--Germany--History--Congresses.
Human settlements--Balkan Peninsula--History--Congresses.
Iron age--Balkan Peninsula--Congresses.