Columbia subject headings:
Harvard subject headings:
Neolithic period--Balkan Peninsula--Congresses.
Neolithic period--Europe, Eastern--Congresses.
Princeton subject headings:
Antiquities, Prehistoric--Balkan Peninsula--Congresses.
Civilization, Ancient--Congresses.
Copper age--Balkan Peninsula--Congresses.
Neolithic period--Balkan Peninsula--Congresses.