Arms Proliferation amidst Poverty THE SIPRI Yearbook is now an established reference work. It is a highly documented and authoritative manual which has been improving its factual content, size and presentation every successive year. This is the fourth edition. The 1973 Yearbook is compiled in four main parts; Strategic Aims Limitation, Special Topics (European security, prohibition of inhumane weapons, UN peacekeeping forces), the Development and Spread of Arras Races, and Deve- lopments in Arms Control and Disarmament.