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Topic
- Rivers--Oregon 20
- United States--Appropriations and expenditures 7
- Ferries 6
- River engineering 6
- Cities and towns 5
- Paddle steamers 4
- River surveys 4
- Bridges 3
- Bodies of water 2
- Docks 2
- Railroad engineering 2
- Warehouses 2
- West (U.S.) 2
- Aerial views 1
- Bears 1
- Bridges--Design and construction 1
- Canals--Design and construction--Costs 1
- Cascade Range 1
- Chautauqua Institution 1
- Corvallis Sand and Gravel Company 1