Secret service: thirty-three centuries of espionage
Rowan, Richard Wilmer,1894-
Deindorfer, Robert G.
London Kimber
1969
'Secret service' originally published, New York: Hawthorn Books, 1967. Revised ed. of 'The story of secret service' by Richard Wilmer Rowan. New York: Doubleday, Doran, 1937
Secret service