Subject
- Boats and boating -- Columbia River3
- Chinook salmon -- Migration -- Columbia River3
- Columbia River Valley3
- Docks -- Columbia River3
- Double-crested cormorant -- Ecology -- Columbia River Estuary (Or. and Wash.)3
- Double-crested cormorant -- Food -- Columbia River Estuary (Or. and Wash.)3
- Nitrogen fertilizers -- Columbia River Watershed3
- Otoliths3
- Pacific salmon fisheries -- Columbia River3
- Radioactive waste disposal3
- Radioactivity3
- River sediments -- Columbia River3
- Water -- Pollution -- Columbia River3
- Water-supply -- Columbia River Watershed -- Management3
- Wheat -- Fertilizers -- Columbia River Watershed3
- Agriculture -- Research -- Lower Columbia River Valley (Or. and Wash.)2
- Agriculture -- Research -- Lower Columbia River Valley (Or. and Wash.) -- Periodicals2
- Anchorage (Structural engineering)2
- Benthic animals -- Columbia River Estuary (Or. and Wash.)2
- Bridges -- Retrofitting2