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- Northwest, Pacific 159
- Rivers 124
- Bodies of water 120
- Photography 117
- Roads 82
- River engineering 75
- Hops 71
- Beer 62
- United States. Congress--Records and correspondence 56
- Riparian areas 40
- Mountains 39
- River surveys 39
- Tourism 30
- River channels 26
- Harbors 22
- Scenic byways 21
- West (U.S.) 21
- Formations (Geology) 18
- Canals 17
- United States--Appropriations and expenditures 17