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Subject
- Hydroelectric power plants.8
- Water-power.4
- Electrical engineering.3
- Engineering.3
- International relations.3
- Aeronautics.2
- Alcoholic beverages--Law and legislation.2
- Allied Forces.2
- Allied Powers (1919- )--History.2
- Aquatic sports.2
- Arnold, Henry Harley, 1886-1950.2
- Construction.2
- Crowds.2
- Curiosities and wonders.2
- Dams.2
- Farms.2
- Hydroelectric generators.2
- Inventions.2
- Labor.2
- Niagara Falls (N.Y.)--Description and travel.2