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- Rivers 164
- Bodies of water 137
- Northwest, Pacific 130
- Photography 77
- Aerial photographs 39
- Riparian areas 38
- Mountains 34
- River engineering 33
- United States. Congress--Records and correspondence 31
- River surveys 29
- River channels 24
- Dams 23
- Harbors 21
- Rapids 16
- West (U.S.) 15
- Canals 13
- Formations (Geology) 13
- Postcards 12
- Bridges--Design and construction 9
- Tourism 9