The General Was a Spy: The Truth About General Gehlen and His Spy Ring
Bantam Books | 1996 | ISBN: 0698104307 | English | 482 pages | PDF | 50 MB
Provides a very good summary of one of the most unusual German Generals and his 'Organization' and what was known when published in 1972. The book includes a nice selection of photographs which help to give background to the events.