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- Irrigation -- Oregon 2
- Irrigation -- Oregon -- Marion County 1
- Irrigation -- Oregon -- Willamette River Valley 6
- Irrigation -- Research. 1
- Irrigation canals 1
- Irrigation efficiency 1
- Irrigation efficiency -- Oregon -- Jefferson County 1
- Irrigation efficiency -- Oregon -- Umatilla County 1
- Irrigation farming -- Economic aspects 1
- Irrigation farming -- Economic aspects -- Oregon -- Deschutes River Valley 1
- Irrigation farming -- Economic aspects -- Oregon -- Jefferson County 1
- Irrigation farming -- Lower Columbia River Valley (Or. and Wash.) 1
- Irrigation farming -- Oregon -- Gilliam County -- Costs 2
- Irrigation farming -- Oregon -- Morrow County -- Costs 2
- Irrigation farming -- Oregon -- Umatilla County -- Costs 2
- Irrigation farming -- Research -- Columbia River Watershed 1
- Irrigation farming -- Research -- Lower Columbia River Valley (Or. and Wash.) 3
- Irrigation farming -- Research -- Oregon 1
- Irrigation farming -- Research -- Oregon, Central 3
- irrigation methods 1