Columbia subject headings:
Harvard subject headings:
Baltic States--History--20th century--Congresses.
Baltic States--Relations--Soviet Union--Congresses.
Latvia--Economic conditions--1940-1991--Congresses.
Latvia--History--20th century--Congresses.
Latvia--Relations--Soviet Union--Congresses.
Soviet Union--Relations--Baltic States--Congresses.
Soviet Union--Relations--Latvia--Congresses.
Princeton subject headings:
Baltic States--History--20th century--Congresses.
Baltic States--Relations--Soviet Union--Congresses.
Latvia--Economic conditions--1940-1991--Congresses.
Latvia--History--20th century--Congresses.
Latvia--Relations--Soviet Union--Congresses.
Soviet Union--Relations--Baltic States--Congresses.
Soviet Union--Relations--Latvia--Congresses.