- Conservation tillage -- Oregon3
- Northern spotted owl -- Conservation -- Oregon, Western2
- Agricultural ecology -- Oregon, Western1
- Barred owl -- Ecology -- Oregon, Western1
- Barred owl -- Food -- Oregon, Western1
- Barred owl -- Habitat -- Oregon, Western1
- Barred owl -- Oregon, Western -- Reproduction1
- Broccoli -- Yields -- Oregon1
- Conservation tillage -- Oregon -- Sherman County -- Mathematical models1
- Conservation tillage -- Oregon, Western1
- Cover crops1
- Cover crops -- Oregon1
- Farm risks -- Oregon -- Sherman County -- Mathematical models1
- Forests and forestry -- Fire management -- Environmental aspects -- Oregon, Western1
- Ground beetles -- Effect of pesticides on-- Oregon, Western1
- Ground beetles -- Environmental enrichment -- Oregon, Western1
- Northern spotted owl -- Ecology -- Oregon, Western1
- Northern spotted owl -- Effect of forest management on -- Oregon, Western1
- Northern spotted owl -- Food -- Oregon, Western1
- Northern spotted owl -- Habitat -- Conservation -- Oregon, Western1