Subject
- Agricultural pests -- Control -- Congresses49
- Codling moth -- Control4
- Vegetable gardening -- Oregon4
- Barred owl -- Reproduction3
- Hazelnuts -- Varieties3
- Northern spotted owl -- Reproduction3
- Acoustic velocity meters2
- Alfalfa leafcutting bee2
- Apples -- Diseases and pests2
- Conifers -- West (U.S.) -- Ecology2
- Douglas fir -- Thinning -- Oregon -- Willamette National Forest2
- Economics -- Societies, etc.2
- Forest ecology -- West (U.S.)2
- Forest management -- Economic aspects -- Oregon -- Willamette National Forest2
- Forest thinning2
- Forest thinning -- Economic aspects -- Oregon -- Willamette National Forest2
- Forests and forestry -- Oregon2
- Grass seed industry -- Oregon2
- Grasses -- Seeds -- Research -- Oregon2
- Lake ecology -- West (U.S.)2