Columbia subject headings:
Baltic Sea Region--Economic policy--Congresses.
Baltic Sea Region--History--Congresses.
Baltic Sea Region--Politics and government--21st century--Congresses.
Harvard subject headings:
Baltic Sea Region--Economic policy--Congresses.
Baltic Sea Region--History--Congresses.
Baltic Sea Region--Politics and government--21st century--Congresses.
Princeton subject headings:
Baltic Sea Region--Economic policy--Congresses.
Baltic Sea Region--History--Congresses.
Baltic Sea Region--Politics and government--21st century--Congresses.