Columbia subject headings:
Communism--Congresses.
Communism--Soviet Union--Congresses.
Kommunisticheskai︠a︡ partii︠a︡ Sovetskogo Soi︠u︡za--Congresses.
Harvard subject headings:
Communism--Congresses
Communism--Soviet Union--Congresses
Kommunisticheskai︠a︡ partii︠a︡ Sovetskogo Soi︠u︡za--Congresses.
Princeton subject headings:
Communism--Congresses.
Communism--Soviet Union--Congresses.
Kommunisticheskai︠a︡ partii︠a︡ Sovetskogo Soi︠u︡za--Congresses.