Columbia subject headings:
Harvard subject headings:
Political refugees--Great Britain--History--Congresses.
Political refugees--Great Britain.
Political refugees--Soviet Union--History--Congresses.
Russians--Great Britain--History--Congresses.
Russians--Great Britain.
Socialism--Great Britain--Congresses.
Princeton subject headings:
Political refugees--Great Britain--History--Congresses.
Political refugees--Soviet Union--History--Congresses.
Russians--Great Britain--History--Congresses.
Socialism--Great Britain--History--Congresses.