Columbia subject headings:
Harvard subject headings:
Europe, Eastern--Economic conditions--Congresses.
Europe, Eastern--Politics and government--Congresses.
Europe, Eastern--Relations--Congresses.
Europe, Eastern--Social life and customs--Congresses.
Princeton subject headings:
Europe, Eastern--Economic conditions--Congresses.
Europe, Eastern--Politics and government--Congresses.
Europe, Eastern--Relations--Congresses.
Europe, Eastern--Social life and customs--Congresses.