Columbia subject headings:
Harvard subject headings:
Communism--Russia--History.
Communism--Soviet Union--History
Lenin, Vladimir Ilʹich, 1870-1924--Sources.
Princeton subject headings:
Communism--Russia--History.
Communism--Soviet Union--History.
Lenin, Vladimir Ilʹich, 1870-1924.
Soviet Union--History--Revolution, 1917-1921--Causes.