(Halifax)International Symposium on Tailings and Effluent Management International Symposium on Tailings and Effluent Management (Manila)International Symposium on Remote Sensing of Environment (Wash.)International Symposium on the Chemistry of Cement The Fifth International Symposium on the Chemistry of Cement International marketing and export management (San Jose)International Symposium on Remote Sensing of Environment International Symposium on the Chemistry of Cement International symposium on mining research (Waterbury)International Symposium on Ozone for Water and Wastewater Treatment