Columbia subject headings:
Black Sea Coast (Turkey)--History--Congresses.
Black Sea Region--Economic conditions--Congresses.
Black Sea Region--Politics and government--Congresses.
Black Sea Region--Social conditions--Congresses.
Harvard subject headings:
Black Sea Coast (Turkey)--History--Congresses.
Black Sea Region--Economic conditions--Congresses.
Black Sea Region--Politics and government--Congresses.
Black Sea Region--Social conditions--Congresses.
Princeton subject headings:
Black Sea Coast (Turkey)--History--Congresses.
Black Sea Region--Economic conditions--Congresses.
Black Sea Region--Politics and government--Congresses.
Black Sea Region--Social conditions--Congresses.