Subject
- Forest ecology -- Oregon5
- Forest soils -- Oregon -- H.J. Andrews Experimental Forest4
- Soil microbial ecology -- Oregon -- H.J. Andrews Experimental Forest4
- Forest soils -- Oregon3
- Lodgepole pine -- Oregon -- Deschutes National Forest3
- Mount Hood National Forest (Or.)3
- Deschutes National Forest (Or.)2
- Douglas fir -- Ecology -- Oregon -- H.J. Andrews Experimental Forest2
- Fire ecology -- Oregon -- Willamette National Forest2
- Forest ecology -- Oregon -- Mount Hood National Forest2
- Forest management -- Oregon2
- Forest management -- Oregon -- Mount Hood National Forest2
- Forest plants -- Oregon2
- Lodgepole pine -- Effect of fires on -- Oregon -- Deschutes National Forest2
- Old growth forest ecology -- Oregon -- H.J. Andrews Experimental Forest2
- Soil ecology -- Oregon2
- Soil ecology -- Oregon -- H.J. Andrews Experimental Forest2
- Air -- Pollution -- Health aspects -- Oregon -- Bend1
- Animal burrowing -- Environmental aspects -- Oregon -- Siuslaw National Forest1
- Animal-plant relationships -- Oregon -- Deschutes National Forest1