Columbia subject headings:
Harvard subject headings:
Communism--Soviet Union--Congresses
Communism--Soviet Union--History--Congresses.
Nationalism and socialism--History--20th century--Congresses.
Nationalism--Soviet Union--Congresses.
Nationalism--Soviet Union--History--20th century--Congresses.
Soviet Union--Politics and government--1917-1936--Congresses.
Soviet Union--Politics and government--Congresses.
Princeton subject headings:
Communism--Soviet Union--History--20th century--Congresses.
Nationalism and socialism--History--20th century--Congresses.
Nationalism--Soviet Union--History--20th century--Congresses.
Soviet Union--Politics and government--Congresses.