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Topic
- Rivers--Oregon 43
- Rivers 20
- Bridges 19
- Bodies of water 15
- West (U.S.) 13
- Northwest, Pacific 12
- Canals--Design and construction--Costs 10
- Dams--Design and construction 10
- Transportation 10
- Water resources development 10
- Cities and towns 9
- Roads 9
- Lichens 6
- River engineering 5
- United States. Congress--Records and correspondence 5
- Dams 4
- Harbors 4
- River surveys 4
- Dirt roads 2
- Fishing 2
