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- Community organization 119
- African Americans 74
- United States--Appropriations and expenditures 45
- West (U.S.) 45
- River engineering 41
- Beer 36
- Hops 36
- Brewing 34
- Transportation 29
- Canals--Design and construction--Costs 27
- Dams--Design and construction 27
- Bodies of water 22
- Northwest, Pacific 22
- Rivers 22
- Water resources development 22
- River surveys 21
- United States. Congress--Records and correspondence 9
- Asian Americans 8
- Immigrants 8
- Art--Documentation 5