Subject
- Agricultural ecology -- Oregon -- Willamette River Valley1
- Bees -- Food -- Oregon -- Willamette River Valley1
- Bees -- Habitat -- Oregon -- Willamette River Valley1
- Bees -- Oregon -- Willamette River Valley1
- Blueberries -- Pollination -- Oregon -- Willamette River Valley1
- Pollination by bees -- Oregon -- Willamette River Valley1