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One of the most uninteresting books about intelligence. Can easily stand as an appendix of the much more interesting and useful book written by one of the authors - Christopher Andrew with Vasili Mitrokhin - The sword and the shield. The Mitrokhin archive ... vol. I." or the book written by the same authors KGB The inside story of its Foreign Operations...". There is nothing useful inside this book. The text is so dry with nothing interesting, that after reading the book just once I felt no need to read it again. Save your money and simply skip this book with no emotions.