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Creator
- United States. Bonneville Power Administration 25
- United States. Department of the Interior 25
Topic
- Northwest, Pacific 25
- Water-power 22
- Public utilities 10
- Dams 5
- Transportation 4
- Industrialization 3
- Irrigation 3
- Agriculture 2
- Hydroelectric power plants 2
- Locks (Hydraulic engineering) 2
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Type
- Text 24
- Collection 1
Decade
- 1940-1949 25