Columbia subject headings:
Baltic States--History.
Baltic States--Politics and government--Soviet Union.
Regionalism--Soviet Union.
Harvard subject headings:
Baltic States--Politics and government--Congresses.
Regionalism--Baltic States--Congresses.
Regionalism--Soviet Union--Congresses.
Princeton subject headings:
Baltic States--Politics and government--Congresses.
Regionalism--Baltic States--Congresses.
Regionalism--Soviet Union--Congresses.