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Topic
- Agriculture 2
- Bodies of water 3
- Bridges 1
- Conservation of natural resources 3
- Cranes, derricks, etc 2
- Dams 27
- Electric power production 2
- Electric power-plants 1
- Environmental impact analysis 1
- Factories 12
- Fisheries 2
- Fishways 7
- Flood control 1
- Flumes 1
- Hydraulic engineering 1
- Hydroelectric generators 3
- Hydroelectric power plant retirement 12
- Hydroelectric power plants 58
- Hydrothermal electric power systems 2
- Industrial buildings 12
