Columbia subject headings:
Harvard subject headings:
Communism--History
Kommunisticheskai︠a︡ partii︠a︡ Sovetskogo Soi︠u︡za--History.
Soviet Union--History--Revolution, 1917-1921.
Princeton subject headings:
Soviet Union--History--Revolution, 1917-1921--Influence.
Ukraine--History--Revolution, 1917-1921.