Columbia subject headings:
Soviet Union--History--Philosophy.
Soviet Union--History--Revolution, 1917-1921--Historiography.
Soviet Union--History--Revolution, 1917-1921--Philosophy.
Harvard subject headings:
Soviet Union--History--Revolution, 1917-1921--Philosophy.
Soviet Union--History.
Princeton subject headings:
Soviet Union--History--Philosophy.
Soviet Union--History--Revolution, 1917-1921--Historiography.
Soviet Union--History--Revolution, 1917-1921--Philosophy.