Columbia subject headings:
Soviet Union--History--Revolution, 1917-1921.
World War, 1914-1918--Soviet Union.
Harvard subject headings:
Soviet Union--History--Revolution, 1917-1921.
World War, 1914-1918--Russia
World War, 1914-1918--Soviet Union
Princeton subject headings:
Soviet Union--History--Revolution, 1917-1921.
World War, 1914-1918--Soviet Union.