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- Dams 15
- Fish hatcheries 5
- Rivers--Oregon 5
- Lakes--Oregon 4
- Fishing 2
- Fishways 2
- Beavers 1
- Chipmunks 1
- Elk 1
- Indians of North America 1
- Lumber trade 1
- Murres 1
- Puffins 1
- Salmon 1
- Salt River Indian Reservation (Ariz.) 1
- Sea Lion Caves (Or.) 1
- Seining 1
- Spillways 1
- Waterfalls 1