Columbia subject headings:
Perestroĭka--Congresses.
Soviet Union--Politics and government--1985-1991--Congresses.
Harvard subject headings:
Perestroĭka--Congresses
Soviet Union--Politics and government--1985-1991--Congresses.
Princeton subject headings:
Perestroĭka--Congresses.
Soviet Union--Politics and government--1985-1991--Congresses.