Subject
- Forest fires -- Prevention and control6
- Douglas fir4
- Forestry schools and education3
- Industrial arts -- Study and teaching3
- Plant hormones3
- Aeronautics in forest fire control2
- Bark beetles -- Control2
- Christmas trees2
- Cutover lands -- Oregon2
- Family2
- Fisheries -- Oregon2
- Forest fires -- Prevention and control -- Study and teaching2
- Forest influences2
- Forest management2
- Forest reserves -- Recreational use2
- Forestry schools and education -- Oregon2
- Logging2
- Teaching2
- Trees -- Propagation2
- Academic achievement1