Columbia subject headings:
Estonia--History--Revolution, 1917-1918.
Estonia--History--War of Independence, 1918-1920.
Soviet Union--History--Allied intervention, 1918-1920.
Harvard subject headings:
Estonia--History--Revolution, 1917-1918.
Estonia--History--War of Independence, 1918-1920.
Soviet Union--History--Allied intervention, 1918-1920.
Princeton subject headings:
Estonia--History--War of Independence, 1918-1920.
Soviet Union--History--Allied intervention, 1918-1920.