The Max Planck Encyclopedia of International Law (MPEPIL) contains over 1700 peer-reviewed articles on every aspect of international law. The Max Planck Encyclopedia of International Procedural Law (MPEiPRO) maps and analyzes the systems and processes through which international law is made and adjudicated in practice. Both encyclopedias cover a wide array of subjects from air law and the law of outer space to the use of force, war, peace, and neutrality. Option to cross-search between both encyclopedias, as well as search and browse. Updated monthly with new and revised articles.