1. Recreational use of river terraces 2. Revetment harmonious with a river's environment 3. Improvement of reservoir water quality 4. River purification projects 5. Water quality improvement vessel 6. Biological index of water quality in Japan [video cassette]
1. Recreational use of river terraces 2. Revetment harmonious with a river's environment 3. Improvement of reservoir water quality 4. River purification projects 5. Water quality improvement vessel 6. Biological index of water quality in Japan [video cassette]
- Japan [date of publication not identified]
- 1 videocassette (60 min.) : sd. , col
Ricers--Japan.
Water quality--Japan.
Ricers--Japan.
Water quality--Japan.