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- Architecture, American 1640
- Architecture--United States 1622
- Rivers 33
- Bodies of water 32
- Portraits 27
- Northwest, Pacific 26
- Architecture 18
- Photography 18
- River engineering 14
- River surveys 14
- United States. Congress--Records and correspondence 14
- River channels 13
- Riparian areas 12
- Harbors 11
- Mountains 9
- Photographers 9
- Bridges--Design and construction 8
- Canals 7
- United States--Armed Forces--Organization--Charts, diagrams, etc 7
- West (U.S.) 7