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- Pesticides -- Application -- Oregon -- Willamette River Valley2
- Spraying and dusting in agriculture -- Oregon -- Willamette River Valley2
- Blueberries -- Diseases and pests -- Control -- Oregon -- Willamette River Valley1
- Fire resistant plants -- Oregon -- Willamette River Valley1
- Fire resistant plants -- Oregon -- Willamette River Valley -- Pictorial works1
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