Subject
- Freshwater invertebrates -- Ecology -- Oregon, Eastern1
- Freshwater invertebrates -- Ecology -- Washington (State), Eastern1
- Freshwater invertebrates -- Effect of water levels on -- Oregon, Eastern1
- Freshwater invertebrates -- Effect of water levels on -- Washington (State), Eastern1
- Freshwater invertebrates -- Oregon, Eastern1
- Freshwater invertebrates -- Washington (State), Eastern1
- Water withdrawals -- Environmental aspects -- Oregon, Eastern1
- Water withdrawals -- Environmental aspects -- Washington (State), Eastern1