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Topic
- Bodies of water 102
- Rivers 93
- Northwest, Pacific 85
- Photography 62
- River engineering 33
- Riparian areas 32
- United States. Congress--Records and correspondence 32
- River surveys 31
- River channels 23
- Harbors 21
- Mountains 21
- Rapids 19
- West (U.S.) 18
- Canals 15
- Formations (Geology) 15
- Postcards 14
- Steamboats 11
- United States--Armed Forces--Organization--Charts, diagrams, etc 11
- Waterfalls 9
- Bridges--Design and construction 8
