1. å?æ±å¤ªé??ãü®ãü¯ãü¢ãü¾ã?? / HEADWATERS OF THE TONE RIVER 2. ç?°å¢?é?³ å?¶ãü®å£± / ENVIRONMENTAL SOUNDS AT EROSION CONTROL WEIR 3. å?æ±å¤ªé??ãü®ã??ãü?ãüã??ãü? / FLOW OF THE TONE RIVER 4. ç?°å¢?é?³ å?¶ãü®å¼ / UNDERWATER SOUNDS AT TONE CANAL 5. å?æ±å¤ªé??ãü®ãü?ã??ãü¾ãü? / ESTUARY OF THE TONE RIVER 6. ç?°å¢?é?³ å?¶ãü®å? / ENVIRONMENTAL SOUNDS AT BENCHMARK STONE