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- Water quality biological assessment4
- Water quality management3
- Standards2
- Bacterial pollution of water1
- Caddisflies1
- Catalogs and collections1
- Databases1
- Drinking water1
- Equipment and supplies1
- Freshwater insects1
- Mayflies1
- Pollution1
- Sampling1
- Stone flies1
- Stoneflies1
- Water1
- Water quality1
- Water-supply1
- Wetland ecology1