Columbia subject headings:
Russia--History--February Revolution, 1917.
Soviet Union--History--Revolution, 1917-1921.
Harvard subject headings:
Revolutions--Russia (Federation)--History.
Russia--History--February Revolution, 1917
Soviet Union--History--Revolution, 1917-1921
Princeton subject headings:
Russia--History--February Revolution, 1917--Causes.
Soviet Union--History--Revolution, 1917-1921--Causes.