Title: Department of State, Cable, Secretary of State to London, June 18, 1971, Secret, NARA.
Creator: Department of State
Date in Source: June 18, 1971
Subject: Great Britain - British government - Intelligence facilities - Acoustic intelligence - Sound Surveillance System - SOSUS - RAF Brawdy - Submarine surveillance - Hydrophones - Project BACKSCRATCH - Negotiations
Format: 7 p.