Subject
- Agricultural pests -- Control -- Congresses8
- 4-H clubs3
- Apples -- Diseases and pests1
- DNA viruses1
- Douglas fir -- Thinning -- Oregon, Western1
- Douglas fir -- Wounds and injuries -- Economic aspects -- Oregon1
- Douglas fir -- Wounds and injuries -- Economic aspects -- Washington (State)1
- Douglas fir tussock moth -- Biological control1
- Erosion -- Mathematical models1
- Error analysis (Mathematics)1
- Farm income -- Oregon -- Willamette River Valley1
- Farm management -- Decision making1
- Farmers -- Supplementary employment -- Oregon -- Willamette River Valley1
- Forest products industry -- Oregon1
- Forest thinning -- Oregon, Western1
- Forms, Quadratic1
- Juniper -- West (U.S.) -- Control1
- Labor supply -- Oregon -- Willamette River Valley1
- Lumber trade -- Oregon1
- Ocean temperature -- Pacific Ocean1