Set of four counterintelligence and undercover operations manuals from 1981

This is a rare set of four counterintelligence and undercover operations manuals from 1981, published by Interservice Publishing Company, San Francisco. These booklets cover a range of topics critical to intelligence gathering, surveillance, and covert operations, offering insight into the techniques used during the Cold War era. Each booklet is hole-punched for binder use and contains detailed training material on observation, agent recruitment, operational security, and undercover procedures. The set includes “Observation and Description,” “Undercover Operations,” “Hostile Espionage Organization and Methods of Operation,” and “Handbook of Open Sources.” The pages remain in good condition, with minimal wear, making this a fascinating collectible for historians, researchers, or those with an interest in intelligence studies.