Columbia subject headings:
Revolutions--Russia--History.
Russia--History--20th century.
Russia--Politics and government--20th century.
Harvard subject headings:
Revolutions--Russia--History.
Soviet Union--History--1917-1936.
Soviet Union--Politics and government--1917-1936.
Princeton subject headings:
Revolutions--Russia--History.
Russia--History--20th century.
Russia--Politics and government--20th century.