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