This twenty-first edition of the SIPRI Yearbook presents detailed information on arms and arms control issues in a format that is both concise and standardized for ease of use. The Yearbooks attract worldwide attention and are useds by governments, arms control negotiators, United Nations delegations, parliaments, scholars, students, the media, and citizens as unique and indispensable reference works.The SIPRI Yearbook 1990 continues SIPRI's review of the latest developments in nuclear weapons, nuclear explosions, world military expenditure, the international arms trade, chemical and biological weapons, the military use of outer space, ongoing armed conflicts and European arms control, and presents the unique annual calendar of military activities required by the Stockholm Document. Efforts to control the arms race - in nuclear, chemical, biological, conventional, and space weapons - are described, and the status of negotiations and agreements is analysed.In addition to these regular features and statistics, this latest SIPRI Yearbook contains special studies on debt and international security, on the prospects for the 1990 Review Conference of the Non-Proliferation Treaty, on laser isotope separation technology, and on the NATO debate over the modernization of short-range nuclear missiles. Its comprehensive coverage makes it an invaluable sourcebook for anyone seeking authoritative, factual information on issues of armaments and disarmament and thus to anyone interested in strategic studies, war studies, peace studies, and international relations.