Columbia subject headings:
Harvard subject headings:
Russia--History--February Revolution, 1917.
Russia--Politics and government--1801-1917.
Soviet Union--History--Revolution, 1917-1921--Causes.
Princeton subject headings:
Russia--History--February Revolution, 1917.
Russia--Politics and government--1801-1917.
Soviet Union--History--Revolution, 1917-1921--Causes.