Columbia subject headings:
Espionage, Soviet--Great Britain--History--20th century.
Spies--Great Britain--Biography.
Spies--Soviet Union--Biography.
Harvard subject headings:
Espionage, Soviet--Great Britain--History--20th century.
Maclean, Donald, 1913-1983.
Spies--Great Britain--Biography.
Spies--Soviet Union--Biography.
Princeton subject headings:
Espionage, Soviet--Great Britain--History--20th century.
Maclean, Donald, 1913-1983.
Spies--Great Britain--Biography.
Spies--Soviet Union--Biography.