A file containing documents concerning the application of international treaties and conventions to West Berlin. Subjects covered in the file include the question of whether the environmental modification convention should be extended to West Berlin; whether Allied rights and responsibilities, or the security and status of West Berlin, were affected by particular agreements; and the need for close examination of disarmament treaties due to the complex political and legal issues raised. Other subjects covered in the file include Soviet, East German, Czechoslovak, and Hungarian protests against the extension of certain agreements to Berlin; references to the 1971 Quadripartite Agreement; a draft convention on the physical protection of nuclear materials; and a legal opinion from the European Commission. Documents in the file include examples of declarations made by the West German government when extending international agreements to West Berlin.