Subject
- Plant communities -- Oregon18
- Plant communities14
- Plant communities -- Oregon -- H.J. Andrews Experimental Forest5
- Plant communities -- Washington (State)4
- U.S. International Biological Program. Coniferous Forest Biome4
- Vegetation classification -- Oregon4
- Forest ecology -- Oregon3
- H.J. Andrews Experimental Forest (Or.)3
- Plant communities -- Oregon -- Willamette River Valley3
- Plant communities -- Oregon, Eastern3
- Lichens -- Oregon2
- McDonald Forest (Or.)2
- Paul Dunn Forest (Or.)2
- Plant communities -- Coast Ranges2
- Plant competition2
- Plants -- Oregon -- H.J. Andrews Experimental Forest2
- Soils -- Oregon -- H.J. Andrews Experimental Forest2
- Steppe plants -- Oregon2
- Vegetation classification2
- Abies grandis1