Columbia subject headings:
Baltic States--Foreign relations--Soviet Union--History--Sources.
Baltic States--History--Sources.
Soviet Union--Foreign relations--Baltic States--History--Sources.
World War, 1939-1945--Baltic States.
Harvard subject headings:
Estonia--Foreign relations--Soviet Union--Sources.
Latvia--Foreign relations--Soviet Union--Sources.
Lithuania--Foreign relations--Soviet Union--Sources.
Soviet Union--Foreign relations--Estonia--Sources.
Soviet Union--Foreign relations--Latvia--Sources.
Soviet Union--Foreign relations--Lithuania--Sources.
Princeton subject headings:
Baltic States--Foreign relations--Soviet Union--Sources.
Soviet Union--Foreign relations--Baltic States--Sources.
World War, 1939-1945--Baltic States--Sources.