Western Waters Digital Library
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Topic
- Transportation 53
- Northwest, Pacific 41
- Bodies of water 35
- West (U.S.) 34
- Rivers 33
- Canals--Design and construction--Costs 31
- Water resources development 30
- Dams--Design and construction 29
- River engineering 11
- United States--Appropriations and expenditures 11
- River surveys 7
- United States. Congress--Records and correspondence 7
- Photography 5
- Agriculture 4
- Water-power 4
- Irrigation 3
- Maps 3
- Bridges--Design and construction 2
- Conservation of natural resources 2
- Dams 2