International Conferecne on defects in Insulating Crystals,Gatlinburg,Tenn.1977 Internatioanl Conference on Defects in Insulating Crystals,Gatlinburg,Tenn,Oct.9-14,1977 International Conference on Vibrations in Rotating Machniery,2d International Conference on New Developments in Automatic Testing International conference on Gas Discharges International Conference on Effect of Hydrogen on Behavior of Materials International Conference on Effect of Hydrogen on Behavior of materials International Conference on Recrystallization in Metallic Materials International conference on Pressure Surges Fifth international conference on radio receivers and associated systems.