The SIPRI Yearbooksdescribe as factually as possible the major quantitative and qualitative changes that take place each year in the world's arsenals, and analyze the efforts made to control them. Much of the information in the Yearbooks—nuclear weapon testing, chemical and biological warfare, the arms trade, and military budgets, for example—is not available or covered as thoroughly anywhere else. The Yearbookfor 1974, 1975, and 1976 are also available from The MIT Press in the United States, The British Commonwealth, and Latin America.