- Ryegrasses -- Fertilizers -- Oregon, Western3
- Blackberries -- Fertilizers -- Oregon, Western2
- Blackberries -- Oregon, Western -- Nutrition2
- Deficiency diseases in plants -- Oregon, Western2
- Grass seed industry -- Oregon, Eastern2
- Raspberries -- Fertilizers -- Oregon, Western2
- Raspberries -- Oregon, Western -- Nutrition2
- Agricultural pests -- Control -- Congresses1
- Airplanes, Wooden -- Design and construction1
- Animal-plant relationships -- Blue Mountains (Or. and Wash.)1
- Blue Mountains (Or. and Wash.)1
- Blueberries -- Fertilizers -- Oregon1
- Bluegrasses -- Oregon, Eastern1
- Bluegrasses -- Seeds -- Oregon, Eastern1
- Christmas tree growing -- Oregon, Western1
- Christmas tree growing -- Washington (State)1
- Christmas trees -- Fertilizers -- Oregon, Western1
- Christmas trees -- Fertilizers -- Washington (State)1
- Christmas trees -- Nutrition -- Oregon, Western1
- Christmas trees -- Nutrition -- Washington (State)1