Seth, Ronald. Spies at work : a history of espionage / Ronald Seth. - New York : Philosophical Library, 1954 - 234 p., [7] leaves of plates. ; ill. ; 22 cm. Includes bibliography and index LCCN: 55003142 Subjects--Topical Terms: Espionage. Dewey Class. No.: 327.1 / SES 1954