Columbia subject headings:
Soviet Union--History--Revolution, 1917-1921.
Harvard subject headings:
Soviet Union--History--Revolution, 1917-1921.
Princeton subject headings:
Communism--Russia--History.
Russia--History--Nicholas II, 1894-1917.
Russia--History--Revolution, 1905-1907.
Russia--Politics and government--1894-1917.
Soviet Union--History--Revolution, 1917-1921.