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- Northwest, Pacific 67
- Rivers 63
- Photography 61
- Bodies of water 55
- Riparian areas 28
- Mountains 23
- River engineering 17
- United States--Appropriations and expenditures 13
- Formations (Geology) 12
- Nature 10
- Postcards 10
- Travel 10
- Steamboats 8
- Aerial photographs 6
- River surveys 6
- Scenic byways 6
- Dams 5
- Jetties 5
- Locks (Hydraulic engineering) 5
- Railroads 5