Columbia subject headings:
Harvard subject headings:
Baltic Sea Region--Foreign relations--Congresses.
Baltic Sea Region--Study and teaching--Congresses.
Europe, Northern--Foreign relations--Congresses.
Princeton subject headings:
Baltic Sea Region--Foreign public opinion--Congresses.
Baltic Sea Region--Relations--Congresses.
Baltic Sea Region--Study and teaching--Congresses.
European Union--Congresses.
Regionalism--Europe--Congresses.