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Topic
- United States. Congress--Records and correspondence 99
- River engineering 81
- Northwest, Pacific 76
- River surveys 37
- Bodies of water 32
- Rivers 32
- Bridges--Design and construction 23
- Harbors 23
- River channels 23
- Rapids 17
- West (U.S.) 15
- Canals 14
- United States--Armed Forces--Organization--Charts, diagrams, etc 10
- United States--Appropriations and expenditures 9
- Transportation 4
- Military maps 2
- Military topography 2
- Agriculture 1
- Conservation of natural resources 1
- Exports 1