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Topic
- Rivers 84
- Bodies of water 80
- Northwest, Pacific 68
- Photography 30
- River engineering 30
- United States. Congress--Records and correspondence 30
- River surveys 29
- Riparian areas 22
- River channels 22
- Harbors 21
- Aerial photographs 19
- Dams 18
- West (U.S.) 15
- Rapids 14
- Mountains 13
- Canals 12
- United States--Armed Forces--Organization--Charts, diagrams, etc 9
- Formations (Geology) 8
- Bridges--Design and construction 6
- Maps 5
