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- Agriculture 1
- Bodies of water 2
- Conservation of natural resources 2
- Fisheries 1
- Forests and forestry 1
- Irrigation projects 1
- Maps 2
- Mineral industries 1
- National parks and reserves 1
- Northwest, Pacific 2
- Photography 1
- Renewable energy sources 1
- River engineering 1
- Rivers 2
- Salmon fisheries 1
- Salmon 1
- Transportation 1
- United States. Congress--Records and correspondence 1
- Water resources development 2
- Water-power 2
