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