Columbia subject headings:
Greece--Civilization--Congresses.
Greeks--Black Sea Region, Northern--Congresses.
Rome--Civilization--Congresses.
Harvard subject headings:
Greece--Civilization--To 146 B.C.--Congresses.
Greeks--Ukraine--Black Sea Lowland--Congresses.
Rome--Civilization--Congresses.
Princeton subject headings:
Greece--Civilization--Congresses.
Greeks--Black Sea region, Northern--Congresses.
Rome--Civilization--Congresses.