Columbia subject headings:
Russia--History.
Soviet Union--History--Revolution, 1917-1921.
Soviet Union--History.
Harvard subject headings:
Russia--History--1801-1917.
Russia--History.
Soviet Union--History--Revolution, 1917-1921.
Soviet Union--History.
Princeton subject headings:
Russia--History.
Soviet Union--History--Revolution, 1917-1921.
Soviet Union--History.