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- Northwest, Pacific 191
- Rivers 154
- Bodies of water 152
- Photography 117
- River engineering 76
- United States. Congress--Records and correspondence 56
- Aerial photographs 41
- Riparian areas 40
- River surveys 39
- Mountains 37
- Tourism 30
- River channels 26
- Dams 25
- Harbors 22
- Scenic byways 21
- West (U.S.) 21
- Formations (Geology) 18
- United States--Appropriations and expenditures 18
- Canals 17
- Waterfalls 17