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- Crop yield 2
- crop yield 1
- Cropping systems 1
- cropping systems 1
- Cropping systems -- Oregon 1
- Cropping systems -- Oregon, Eastern 1
- Crops -- Effect of acid precipitation on 3
- Crops -- Effect of fluorides on -- Oregon -- The Dalles 1
- Crops -- Effect of pollution on -- Oregon -- The Dalles 1
- Crops -- Irrigation 1
- Crops -- Irrigation -- Lower Columbia River Valley (Or. and Wash.) 3
- Crops -- Irrigation -- Oregon 1
- Crops -- Irrigation -- Oregon -- Columbia River Watershed 1
- Crops -- Irrigation -- Oregon, Central 3
- Crops -- Marketing -- Research -- Oregon -- Malheur County 1
- Crops -- Oregon -- Klamath County -- Field experiments 15
- Crops -- Oregon -- Willamette Valley 1
- Crops -- Oregon, Western 1
- Crops -- Research -- Lower Columbia River Valley (Or. and Wash.) 1
- Crops -- Research -- Oregon 1