Columbia subject headings:
Harvard subject headings:
Communism--Soviet Union--Congresses
Princeton subject headings:
Kommunisticheskai︠a︡ partii︠a︡ Sovetskogo Soi︠u︡za--Congresses.
Rossiĭskai︠a︡ kommunisticheskai︠a︡ partii︠a︡ (bolʹshevikov)--Congresses.
Soviet Union--Politics and government--1917-1936--Congresses.