Columbia subject headings:
Black Sea Region--Antiquities--Congresses.
Greeks--Black Sea Region--History--Congresses.
Harvard subject headings:
Black Sea Coast--Antiquities--Congresses.
Black Sea Region--Antiquities--Congresses.
Greeks--Black Sea Coast--History--Congresses.
Greeks--Black Sea Region--History--Congresses.
Princeton subject headings:
Black Sea region--Antiquities--Congresses.
Greeks--Black Sea region--History--Congresses.