Columbia subject headings:
Soviet Union--History--1917-1936.
Soviet Union--History--Revolution, 1917-1921.
Soviet Union--History.
Soviet Union.
World War, 1939-1945--Soviet Union.
Harvard subject headings:
Soviet Union
Soviet Union--History.
World War, 1939-1945--Soviet Union.
Princeton subject headings:
Soviet Union--History--1917-1936.
Soviet Union.
World War, 1939-1945--Soviet Union.