As part of the Weather Modification: Programme approved by the Seventh World Meteerological Congress (Geneva, 1975),... the.Secretary General maintains.a Register:o£ Experiments and operations in weather modification carried out within Member countries. The present publication is the ninth of its kind and is based on information received from Member countries on experiments and operations sponsored by governmental agencies and private concerns: that took place during 1983. For various reasons, the register does not contain information on all weather modification projects.