Columbia subject headings:
Harvard subject headings:
Communism--Soviet Union--Congresses
Rossiĭskai︠a︡ sot︠s︡ial-demokraticheskai︠a︡ rabochai︠a︡ partii︠a︡--Congresses.
Princeton subject headings:
Communism--Russia--Congresses.
Rossiĭskai︠a︡ sot︠s︡ial-demokraticheskai︠a︡ rabochai︠a︡ partii︠a︡--Congresses.