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- United States--Appropriations and expenditures 8
- River engineering 7
- West (U.S.) 6
- Dams--Design and construction 3
- Locks (Hydraulic engineering) 3
- Architectural photography 2
- Historic house museums 2
- McLoughlin House National Historic Site (Oregon City, Or.) 2
- Pioneers--Oregon--Biography 2
- Railroad engineering 2
- River surveys 2
- Beer 1
- Bodies of water 1
- Buildings 1
- Canals--Design and construction--Costs 1
- Hops 1
- Landscapes 1
- Rivers 1
- Storefronts 1
- Transportation 1