Columbia subject headings:
Russia--History--Revolution, 1905-1907.
Soviet Union--History--Revolution, 1917-1921.
Trotsky, Leon, 1879-1940.
Harvard subject headings:
Russia--History--Nicholas II, 1894-1917.
Soviet Union--History--Revolution, 1917-1921.
Princeton subject headings:
Soviet Union--History--Revolution, 1917-1921.