Subject
- Celilo Falls (Wash.)2
- Chinook salmon -- Columbia River2
- Chinook salmon -- Columbia River Estuary (Or. and Wash.)2
- Chinook salmon -- Columbia River Estuary (Or. and Wash.) -- History2
- Chinook salmon -- Migration -- Columbia River Estuary (Or. and Wash.)2
- Chinook salmon -- Mortality -- Columbia River Estuary (Or. and Wash.)2
- Colonial birds -- Ecology -- Columbia River Estuary (Or. and Wash.)2
- Columbia River Valley -- Ethnic Relations -- History2
- Concrete bridges -- Columbia River -- Maintenance and repair2
- Concrete bridges -- Oregon -- Mosier -- Maintenance and repair2
- Crops -- Research -- Lower Columbia River Valley (Or. and Wash.)2
- Crops -- Research -- Lower Columbia River Valley (Or. and Wash.) -- Periodicals2
- Estuarine ecology -- Columbia River Estuary (Or. and Wash.)2
- Fish habitat improvement -- Columbia River2
- Fisheries -- Columbia River2
- Fishery management -- Columbia River2
- Flexure2
- Fur trade -- Columbia River Valley -- History2
- Hanford Site (Wash.) -- Environmental aspects2
- Indians of North America -- Commerce -- Columbia River Valley2