Columbia subject headings:
Estonia--History--War of Independence, 1918-1920.
Estonia. Treaties, etc., 1920 February 2.
Harvard subject headings:
Estonia--Foreign relations--Soviet Union.
Estonia--History--Revolution, 1917-1918.
Estonia. Treaties, etc. 1920 February 2
Estonia. Treaties, etc. 1920 February 2.
Soviet Union--Foreign relations--Estonia.
Soviet Union--History--Revolution, 1917-1921.
Princeton subject headings: