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Topic
- Rivers 108
- Bodies of water 98
- Northwest, Pacific 91
- Photography 46
- River engineering 36
- Riparian areas 32
- River surveys 32
- United States. Congress--Records and correspondence 32
- River channels 23
- Mountains 22
- Harbors 21
- Aerial photographs 18
- Dams 18
- Rapids 18
- West (U.S.) 17
- Canals 16
- United States--Armed Forces--Organization--Charts, diagrams, etc 10
- Formations (Geology) 9
- Boats and boating 8
- Bridges--Design and construction 8