Columbia subject headings:
Black Sea Coast--Antiquities--Congresses.
Black Sea Coast--History--Congresses.
Harvard subject headings:
Acculturation--Black Sea Region--Congresses.
Black Sea Region--Antiquities--Congresses.
Black Sea Region--Civilization--Congresses.
Intercultural communication--Black Sea Region--History--Congresses.
Material culture--Black Sea Region--Congresses.
Princeton subject headings:
Black Sea Coast--Antiquities--Congresses.
Black Sea Coast--History--Congresses.