Twelfth General Assembly of International Scientific Radio Union

We are privileged to present in the following pages a series of reports covering the major activities of the Twelfth General Assembly of the International Scientific Radio Union (URSI) held in Boulder, Colo. last summer. The material was prepared especially for this issue by officials of the seven US Commissions of URSI, under the coordinating guidance of Frederic H. Dickson, international Vice-Chairman of Commission IV and member of the US National Committee of URSI.