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- Hydroelectric power plants 26
- Water-power 13
- Factories 12
- Hydroelectric power plant retirement 12
- Industrial buildings 12
- Northwestern Electric Company 12
- Power-plants 12
- Dams 6
- Spillways 4
- Hydroelectric generators 3
- Turbine pumps 3
- Cranes, derricks, etc 2
- Rivers 2
- Bridges 1
- Electric power production 1
- Electric power-plants 1
- Flumes 1
- Marquees 1
- Motion picture theaters 1
- River engineering 1
