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Creator
- United States. Bonneville Power Administration 26
- United States. Department of the Interior 26
Topic
- Water-power 26
- Northwest, Pacific 22
- Public utilities 11
- Dams 4
- Industrialization 4
- Agriculture 3
- Hydroelectric power plants 3
- Irrigation 2
- Locks (Hydraulic engineering) 2
- Maps 2
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Type
- Text 25
- Collection 1
Decade
- 1940-1949 26