Subject
- California condor -- Habitat -- Pacific Coast (U.S.)1
- California condor -- Pacific Coast (U.S.) -- Genetics1
- California condor -- Pacific Coast (U.S.) -- Geographical distribution -- History1
- California condor -- Reintroduction -- Northwest, Pacific1
- Carbon cycle (Biogeochemistry)1
- Clearcutting1
- Coastal cutthroat trout -- Climatic factors -- Oregon, Western1
- Coastal cutthroat trout -- Effect of logging on -- Oregon, Western1
- Entropy (Information theory)1
- Fish populations -- Missouri River Watershed1
- Fishes -- Geographical distribution1
- Forest biogeochemistry1
- Forest management -- West (U.S.) -- Citizen participation1
- Forests and forestry -- Fire management -- West (U.S.)1
- Host-parasite relationships1
- John Day River (Or.) -- Ecology1
- Land use -- Environmental aspects -- Oregon -- Willamette River Watershed1
- Nitrates -- Environmental aspects -- Oregon -- Willamette River Watershed1
- Nitrogen cycle -- Oregon -- Willamette River Watershed1
- Poplar -- Disease and pest resistance1