Subject
- Bumblebees -- Northwest, Pacific -- Identification2
- Eastern filbert blight -- Control -- Oregon2
- Walnut -- Diseases and pests -- Northwestern States2
- Animal-plant relationships -- Blue Mountains (Or. and Wash.)1
- Automobiles -- Scrapping1
- Beach erosion -- Oregon1
- Blue Mountains (Or. and Wash.)1
- Combustion1
- Ecological assessment (Biology)1
- Engineering1
- Forage plants -- Oregon1
- Forest ecology -- Blue Mountains (Or. and Wash.)1
- Forest ecology -- Oregon, Eastern1
- Forest health -- Oregon1
- Forest management -- Oregon, Eastern1
- Forest thinning -- Northwest, Pacific1
- Forests and forestry -- Oregon, Eastern1
- Fuel -- Testing1
- Gasoline -- War use1
- Grazing1