Columbia subject headings:
Kommunisticheskai͡a partii͡a Sovetskogo Soi͡uza--Party work--Congresses.
Working class--Soviet Union--Congresses.
Harvard subject headings:
Kommunisticheskai︠a︡ partii︠a︡ Sovetskogo Soi︠u︡za--Party work--Congresses.
Working class--Soviet Union--Congresses.
Princeton subject headings:
Kommunisticheskai︠a︡ partii︠a︡ Sovetskogo Soi︠u︡za--Party work--Congresses.
Working class--Russia--Congresses.