Columbia subject headings:
Espionage, British--Spain--History--20th century.
Philby, Kim, 1912-1988.
Spain--History--Civil War, 1936-1939--Secret service.
Spies--Great Britain--Biography.
Harvard subject headings:
Espionage, British--Spain--History--20th century.
Philby, Kim, 1912-1988.
Spain--History--Civil War, 1936-1939--Secret service.
Spies--Great Britain--Biography.
Princeton subject headings:
Espionage, British--Spain--History--20th century.
Philby, Kim, 1912-1988.
Spain--History--Civil War, 1936-1939--Secret service.
Spies--Great Britain--Biography.