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Topic
- Dams 20
- Northwest, Pacific 20
- Bodies of water 19
- Aerial photographs 18
- Rivers 18
- Maps 4
- Hydroelectric power plants 2
- Industrialization 2
- Water-power 2
- Agriculture 1
- Conservation of natural resources 1
- Electric power production 1
- Hydrothermal electric power systems 1
- Irrigation 1
- Locks (Hydraulic engineering) 1
- Northwest, Pacific--History 1
- Photography 1
- Public utilities 1
- Renewable energy sources 1
- Transportation 1