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Topic
- Dams 29
- Northwest, Pacific 29
- Bodies of water 24
- Aerial photographs 23
- Rivers 23
- Water-power 5
- Maps 4
- Hydroelectric power plants 3
- Irrigation 3
- Industrialization 2
- Locks (Hydraulic engineering) 2
- Transportation 2
- Agriculture 1
- Conservation of natural resources 1
- Electric power production 1
- Hydrothermal electric power systems 1
- Northwest, Pacific--History 1
- Photography 1
- Public utilities 1
- Renewable energy sources 1
