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- Northwest, Pacific 208
- United States. Congress--Records and correspondence 116
- River engineering 105
- Public art 97
- Photography 72
- Rivers 36
- Tourism 27
- Scenic byways 26
- Water-power 26
- Decorative arts 24
- Highway engineering 19
- Bridges--Design and construction 17
- Rapids 15
- Public utilities 13
- Explorers 12
- Harbors 12
- Mountains 12
- Art--Documentation 11
- Bodies of water 11
- Maps 11