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Topic
- Hydraulic structures 33
- Dams 20
- Rivers 16
- Building 13
- Reservoirs 5
- Construction equipment 4
- Cranes, derricks, etc 4
- Fountains 4
- Plazas 4
- Public works 3
- Construction workers 2
- Hydraulic engineering 2
- Northwestern Electric Company 2
- Carriages and carts 1
- Electric utilities 1
- Energy industries 1
- Fishes 1
- Fishes--Effect of dams on 1
- Fishways 1
- Horse-drawn vehicles 1
