Internaitonal Symposium on Acoustical Holography and Image,5th,Calif,1973 International Symposium on Acoustical Holography,4th,1972 Internaitonal Symposium on Acoustical Holography and Image,6th,San Diego,1975 Internaitonal Symposium on Acoustical Hoography and Image,6th,San Diego,1975 International Symposium on Space Technology and Science International symposium on plastics testing and standardization International symposium on Humidity and Moisture International Symposium on Affinity Chromatography and Related Techniques International symposium on the electrophysiology of the heart International symposium on stress wave propagation in materials