Columbia subject headings:
Revolutions.
Soviet Union--History--Revolution, 1917-1921--Influence.
Soviet Union--Social conditions.
Harvard subject headings:
Revolutions
Soviet Union--History--Revolution, 1917-1921--Influence.
Soviet Union--Social conditions--1917-1945.
Princeton subject headings:
Revolutions.
Soviet Union--History--Revolution, 1917-1921--Influence.
Soviet Union--Social conditions.