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- Hydroelectric power plants.5
- Construction.2
- Curiosities and wonders.2
- Niagara Falls (N.Y.)--Description and travel.2
- Pottery craft.2
- Aeronautics.1
- Allied Forces.1
- Allied Powers (1919- )--History.1
- Armies.1
- Automobiles--Design and construction.1
- Bands (Music)1
- Boston and Maine Railroad.1
- Candlemaking.1
- Captive chimpanzees.1
- Captive wild animals--Behavior.1
- Ceramics.1
- Children.1
- Chimpanzees--Behavior.1
- Construction workers.1
- Crowds.1