Columbia subject headings:
Communists--Soviet Union--Correspondence.
Kommunisticheskai͡a partii͡a Sovetskogo Soi͡uza--History--Sources.
Rossiĭskai︠a︡ sot︠s︡ial-demokraticheskai︠a︡ rabochai︠a︡ partii︠a︡--History--Sources.
Soviet Union--Politics and government--1917-1936--Sources.
T︠S︡K KPSS--History--Sources.
Harvard subject headings:
Communists--Soviet Union--Correspondence.
Kommunisticheskai︠a︡ partii︠a︡ Sovetskogo Soi︠u︡za--History--Sources.
Rossiĭskai︠a︡ sot︠s︡ial-demokraticheskai︠a︡ rabochai︠a︡ partii︠a︡--History--Sources.
Soviet Union--Politics and government--1917-1936--Sources.
T︠S︡K KPSS--History--Sources.
Princeton subject headings:
Communists--Soviet Union--Correspondence.
Politicians--Soviet Union--Correspondence.
Soviet Union--Politics and government--1925-1953--Sources.