Columbia subject headings:
Harvard subject headings:
Great Britain--Foreign relations--19th century--Sources.
Great Britain--Foreign relations--20th century--Sources.
Great Britain--Foreign relations--Soviet Union--Sources.
Great Britain. Foreign Office--Archives.
Soviet Union--Foreign relations--Great Britain--Sources.
Princeton subject headings:
Great Britain--Foreign relations--Russia--Sources.
Great Britain. Foreign Office--Archives.
Russia--Foreign relations--Great Britain--Sources.