Subject
- Douglas fir9
- Forest fires -- Prevention and control9
- Lumber trade -- Northwest, Pacific5
- Forest management4
- Forests and forestry -- Measurement4
- Forest fires -- Oregon -- Prevention and control3
- Logging -- Northwest, Pacific3
- Plant hormones3
- Ponderosa pine3
- Wood waste -- Recycling3
- Aerial photogrammetry2
- Aeronautics in forest fire control2
- Aeronautics in forestry2
- Bark -- Utilization2
- Building materials2
- Cost accounting2
- Douglas fir -- Pruning2
- Douglas fir -- Reproduction2
- Forest fires -- Prevention and control -- Study and teaching2
- Forest nurseries2