(1989)International Symposium on Processing of Complex Ores International Symposium on Processing of Complex Ores (1989)International Symposium on Agglomeration (1973)International Symposium on Developmentof Ground Water Resources (Manila)International Symposium on Remote Sensing of Environment (San Jose)International Symposium on Remote Sensing of Environment International symposium on mining research (Ann Arbor)International Symposium on Remote Sensing of Environment International Symposium on Remote Sensing of Environment 1st International symposium on ramie prifession