Columbia subject headings:
Baltic States--Foreign relations--History.
International relations--History.
Soviet Union--Foreign relations--History.
Harvard subject headings:
East and West--Congresses
Meissner, Boris--Congresses.
Soviet Union--Foreign relations--Congresses.
World politics--1945-1989--Congresses
Princeton subject headings:
Baltic States--Foreign relations--History.
International relations--History.
Soviet Union--Foreign relations--History.