CIA-How to Spot a Spook, by John D Marks 1974 PDF

The CIA can not exactly open store front offices so its busy workers are stowed away in embassies around the world with State Department 'cover stories'. 

With an embassy personnel list, you stot them...with a little work. 

John D Marks shows how right here. 

John D Marks is is also a former Foreign Service Officer of the U.S. Department of State and co-authored the 1974 controversial non-fiction book The CIA and the Cult of Intelligence with Victor Marchetti and author of The Search for the Manchurian Candidate, a detailed study of the CIA's mind control experiments 

(Washingon Monthly November 1974)