Columbia subject headings:
Harvard subject headings:
Baltic States--Foreign relations.
Baltic States--History.
Europe--Politics and government--1918-1945.
Germany--Foreign relations--Baltic States.
Soviet Union--Foreign relations--Baltic States.
World War, 1939-1945--Baltic States.
Princeton subject headings:
Baltic States--Annexation to Russia.
Baltic States--History.
World War, 1939-1945--Baltic States.