Subject
- Columbia Basin Agricultural Research Center -- Periodicals2
- Agriculture -- Columbia River Watershed -- Periodicals1
- Agriculture -- Columbia River Watershed -- Statistics -- Periodicals1
- Agriculture -- Research -- Lower Columbia River Valley (Or. and Wash.) -- Periodicals1
- Crops -- Research -- Lower Columbia River Valley (Or. and Wash.) -- Periodicals1
- Irrigation farming -- Lower Columbia River Valley (Or. and Wash.) -- Periodicals1
- Merchant marine -- Northwest, Pacific -- Congresses1
- Potatoes -- Soils -- Lower Columbia River Watershed (Or. and Wash.)1
- Range management -- Research -- Oregon1
- Shipping -- Northwest, Pacific -- Congresses1
- Soil fertility -- Lower Columbia River Watershed (Or. and Wash.)1