Columbia subject headings:
Baltic States--History.
Baltic States--Relations--Soviet Union.
Russia--Foreign relations--To 1689.
Soviet Union--Relations--Baltic States.
Harvard subject headings:
Baltic States--Foreign relations--Soviet Union.
Baltic States--History.
Soviet Union--Foreign relations--Baltic States.
Soviet Union--History.
Princeton subject headings:
Baltic States--History.
Baltic States--Relations--Russia.
Russia--Foreign relations--To 1689.
Russia--Relations--Baltic States.