The Soviet Estimate: US Analysis of the Soviet Union, 1947-1991 is a themed microfilm collection which presents an integrated record of US intelligence estimates and studies relating to Soviet strategic projections, military capabilities, science and technology, economics and internal politics, 1946-1991. The estimates and studies were produced either collectively as national intelligence products or by individual agencies, and include contributions from the US Central Intelligence Agency (CIA); the Director of Central Intelligence; the US Defense Intelligence Agency; and, the US State Department. The collection includes CIA and British Secret Intelligence Service debriefing transcripts of former Soviet Gavnoye Razvedyvatelnoye Upravleniye (GRU), Chief Intelligence Directorate, Soviet General Staff, operative Oleg V Penkovskii, relating to Soviet military organisation and plans for nuclear war, Soviet nuclear targets and deployments in Europe, missile technology and launch sites, Soviet military personnel, the capture of Capt Francis Gary Powers, US Air Force U-2 High Altitude Reconnaissance Aircraft pilot, 1 May 1960, profiles of Soviet military officers, locations of Soviet nuclear weapons tests, Soviet intelligence organisations and Soviet chemical and biological weapons programs, Soviet development and deployment of Inter-Continental Ballistic Missiles (ICBMs), positions of Soviet divisions in East Germany, and the Berlin Crisis (1958- 1962), 20 Apr-14 Oct 1961; yearly US estimates of Soviet strategic capabilities, 1947- 1983, including the 'missile gap' National Intelligence Estimates, 1957-1961; detailed estimates of the Soviet space program, including National Intelligence Estimates (NIEs) relating to lunar exploration, manned space flight, reconnaissance satellites, space exploration, space weapons and weapons development, 1962-1967; US Air Force report entitled 'A History of Strategic Arms Competition: Volume 3, A Handbook of Selected Soviet Weapons and Space Systems', including data relating to Soviet air to surface missiles (AS), Tupolev bomber aircraft, M-4 / Mya-4 / 2M Myasishchev ('Bison') aircraft, space weapons, communication satellites, electronic intelligence capabilities, surface to surface (SS) theatre missiles and ICBMs, Intermediate Range Ballistic Missiles (IRBMs), Submarine-Launched Ballistic Missiles (SLBMs), Jun 1976; US intelligence community experiment in competitive analysis conducted by the CIA 'B Team' relating to US misperceptions of Soviet strategic objectives and offensive and defensive forces, Dec 1976; report from the US Department of State entitled 'History of the Strategic Arms Competition 1945-1972, parts 1 and 2', including detailed surveys and analyses of Soviet and US decision making on nuclear forces, force deployments, and nuclear strategies, Mar 1981; Special National Intelligence Estimate relating to Soviet support for international terrorism and revolutionary activities, including mention of arms transfers, military training, political violence, and terrorist activities in Africa, Asia, Europe, Latin America and the Middle East, May 1981; reports from the CIA concerning Soviet perspectives on research and development in energy-directed weapons and involvement in space weapons and Strategic Defense Initiative (SDI) research, 1985; National Intelligence Estimates relating to General Secretary of the Soviet Communist Party Mikhail Sergeyevich Gorbachev's prospects for reforming the Soviet economic and political system, including mention of his economic agenda and its implications for the Soviet military program, the dynamics of Soviet civil-military relations, the impact of reforms on labour production, health, standards of living and technological development, and the rise of civil unrest and nationalism in the Soviet Union, 1985- 1989; CIA report concerning the probabilities of a coup d'etat in the Soviet Union and the growing influence of Chairman of the Russian Republic Supreme Soviet, Boris Nikolayevich Yeltsin, May 1991.

Typescript text of talk by Tyrrell to Wimbledon Literary and Scientific Society [1985], entitled 'Some recollections of a prisoner of war of the Japanese', relating to his experiences as a POW in Zentsuji Camp, Shikoko Island, Japan, 1942-1945. Copies of eight certifications on Tyrrell by Commanding Officers of RN ships and establishments, 1933-1955, with copy of Tyrrell's Mention in Despatches citation for service on HMS ENCOUNTER, Mar 1942, copy of letter relating to the award of the Dutch Order of Orange Nassau, Aug 1948, and copy of newspaper cutting relating to Tyrrell's wedding, Dec 1947. Typescript address by R Adm William Terence Colborne Ridley at Tyrrell's memorial service, Jan 1995.

Papers relating to his naval career, [1920-1959], dated [1920-1959], 1985, principally comprising photographs, [1919-1933], notably of the evacuation of [White] Russian refugees, Black Sea, 1919-1920, and of HMS NELSON, West Indies and Panama, 1929-1931, and HMS GANGES, 1931-1933.

Copies of papers relating to his life and career, 1929-[1962], comprising four letters written while serving in Mediterranean, 1936-1937; text of his speech to the crew of HMS BERWICK in honour of Capt Arliss, 1946; synopsis of his lecture on 'The Royal Navy today', given at the Sociedade Brasileira de Cultura Inglesa, Rio de Janeiro, 1951; curricula vitae, 1955, [1959], [1962].

Midshipman's log book, by Currey, 1876-1878, including service on HMS DUKE OF WELLINGTON, Flagship of Adm Sir George Elliot, Portsmouth, Dec 1876-Jan 1877, HMS ALEXANDRA, Mediterranean Fleet, Jan 1877-Aug 1878 and HMS CRUISER, Mediterranean Fleet, Aug-Sep 1878; papers and plans relating to anti-submarine warfare, 1913-1915, including typescript draft text of lecture by Currey entitled 'Hints on organised coast defence v submarines' [1914]; fifty six manuscript naval signals, Aug-Dec 1914, including signals to R Adm, 5 Battle Sqn from the Admiralty on support to be given to operations by Chatham Royal Marine Force at Ostend, Belgium, 26-27 Aug 1914, signals relating to the loss of the battleship HMS AUDACIOUS to a mine in the Atlantic, 27 Oct 1914, and signals ordering RN battlecruisers HMS INVINCIBLE and HMS INFLEXIBLE to sea, 4 Nov 1914 (prior to the Battle of the Falklands Islands, 8 Dec 1914); journal and signal book kept by Mid Richard Reynell on board Currey's flagship, HMS PRINCE OF WALES, 1914-1915.

Copy of typescript letter sent by Sir John Gerald Lang, Permanent Secretary of the Admiralty, to V Adm Sir William Gerrard Andrewes, Commander in Chief, America and West Indies Station, regarding the efficiency of the cryptographic staffs of HMS SUPERB and HMS SNIPE during naval operations in the Antarctic, 13 Apr 1953