Columbia subject headings:
Harvard subject headings:
Communism--Europe, Eastern
Communism--Europe, Eastern--History--20th century
Europe, Eastern--Foreign relations--Soviet Union.
Europe, Eastern--History--1945-1989.
Europe, Eastern--History--20th century.
Europe, Eastern--Politics and government--1945-1989.
Europe, Eastern--Relations--Soviet Union.
Gorbachev, Mikhail Sergeevich, 1931-
Soviet Union--Foreign relations--Europe, Eastern.
Soviet Union--Politics and government--1945-1991.
Soviet Union--Relations--Europe, Eastern.
Princeton subject headings:
Communism--Europe, Eastern--History--20th century.
Europe, Eastern--Foreign relations--Soviet Union.
Europe, Eastern--History--1945-1989.
Europe, Eastern--Politics and government--1945-1989.
Gorbachev, Mikhail Sergeevich, 1931-2022.
Soviet Union--Foreign relations--Europe, Eastern.
Soviet Union--Politics and government--1945-1991.