From 1955 to 1992 CIA ran a "professional magazine: "Studies in Intelligence", a publication created to "support the development of intelligence as a professional discipline".
Maybe they are still publishing it, so it would be more accurate to say that issues from 1955 to 1992 have been declassified, and can be retrieved from the Archives.gov website.
I have started picking some of the most interesting ones, cleaning them up (the sites hosts digital images of low-quality xerox copies or possibly microfilms, also the text-only version is set up as one file per page and nobody seems to have proofread the OCR output) and creating simple PDF documents.
These provide background material for anyone working on an espionage campaign, especially if set in the sxities/seventies, or even just as reading material for people interested in Intelligence Analysis and spycraft.
- This "brief guide to a common form of deception" - written in 1969 by Dino A. Brugioni, a senior official for the Central Intelligence Agency's National Photographic Interpretation Center, is apparently one of the agency's early documents on the art of (detecting) photo fakery.
- Winter 1961: Observations on the Double Agent, by John P. Dimmer, Jr. (aka F.M. Begoum)
- Summer 1967: Notes on Estimating, by Keith Clark
- Summer 1962: Installation Penetration by Walter Steinmeyer
- Spring 1966: Concerning Espionage and Social Courtesy by Richard Sorge
- Winter 1960: Hypnosis in Interrogation, by Edward F. Deshere
- February 1964: Soviet Use of Assassination and Kidnapping - no author cited. A CIA Memorandum prepared in February 1964 for the President's Commission on the Assassination of President Kennedy (The Warren Commission) and declassified in 1971.