Subject
- Agricultural pests -- Control -- Congresses7
- Forest management -- Congresses3
- Hill farming -- Congresses3
- Hillside planting -- Congresses3
- Codling moth -- Control2
- Agricultural experiment stations -- Research -- Oregon -- Jackson County1
- Agriculture -- Oregon -- Jackson County -- Field experiments1
- Agriculture -- Research -- Lower Columbia River Valley (Or. and Wash.) -- Periodicals1
- Continental margins -- North America1
- Crops -- Research -- Lower Columbia River Valley (Or. and Wash.) -- Periodicals1
- Entomology1
- Geology -- North Pacific Ocean1
- Herbicides1
- Irrigation farming -- Lower Columbia River Valley (Or. and Wash.) -- Periodicals1
- Marine mineral resources -- North Pacific Ocean1
- Weeds -- Control1