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Creator
- United States. Bonneville Power Administration 14
- United States. Department of the Interior 14
Topic
- Public utilities 14
- Water-power 11
- Northwest, Pacific 10
- Industrialization 3
- Agriculture 2
- Hydroelectric power plants 2
- Maps 2
- Dams 1
- Irrigation 1
- Locks (Hydraulic engineering) 1
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Type
- Text 13
- Collection 1
Decade
- 1940-1949 14