Columbia subject headings:
International law--Soviet Union--Congresses.
Perestroĭka--Congresses.
Soviet Union--Foreign relations--1985-1991--Congresses.
Harvard subject headings:
International law--Soviet Union--Congresses.
Perestroĭka--Congresses
Soviet Union--Foreign relations--1985-1991--Congresses.
Princeton subject headings:
International law--Soviet Union--Congresses.
Perestroĭka--Congresses.
Soviet Union--Foreign relations--1985-1991--Congresses.