Subject
- Alfalfa -- Oregon1
- Alfalfa -- Oregon -- Willamette River Valley1
- Flax -- Oregon1
- Forage plants -- Oregon1
- Hardinggrass -- Oregon1
- Lawns -- Weed control1
- Mosses -- Control1
- Noxious weeds1
- Peas -- Oregon1
- Phalaris -- Oregon1
- Root crops -- Oregon1
- Seed potatoes -- Oregon1
- Spraying and dusting in agriculture1
- Vetch1
- Weeds -- Control1
- Wheat -- Oregon1