Columbia subject headings:
Soviet Union--Archival resources--Great Britain--Congresses.
Soviet Union--History--Sources--Congresses.
Harvard subject headings:
Soviet Union--Archival resources--Great Britain--Congresses.
Soviet Union--History--Sources--Congresses.
Princeton subject headings:
Soviet Union--Archival resources--Great Britain--Congresses.
Soviet Union--History--Sources--Congresses.