Columbia subject headings:
Harvard subject headings:
Education--Europe, Eastern--Congresses.
Europe, Eastern--History--Congresses.
Europe, Eastern--Politics and government--Congresses.
Europe, Eastern--Religion--Congresses.
Princeton subject headings:
Education--Europe, Eastern--Congresses.
Europe, Eastern--History--Congresses.
Europe, Eastern--Politics and government--Congresses.
Europe, Eastern--Religion--Congresses.