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Topic
- Dams 12
- Reservoirs 4
- Rivers--Oregon 4
- Aerial photographs 1
- Beavers 1
- Canals 1
- Canyons 1
- Chipmunks 1
- Elk 1
- Fishing 1
- Floods 1
- Formations (Geology) 1
- International regimes 1
- Irrigation 1
- Lumber trade 1
- Mountains--Arizona 1
- Mountains--Oregon 1
- Negotiation 1
- Resource allocation 1
- Riparian areas--Management 1