Subject
- Range plants -- Oregon79
- Forage plants -- Oregon31
- Plant communities -- Oregon18
- Vegetable gardening -- Oregon12
- Plant competition -- Oregon10
- Forest ecology -- Oregon8
- U.S. International Biological Program. Coniferous Forest Biome8
- Plant breeding6
- Plant-soil relationships -- Oregon6
- Plant communities -- Oregon -- H.J. Andrews Experimental Forest5
- Plant ecology5
- Plant succession -- Oregon5
- Rare plants -- Oregon5
- Wetland restoration -- Oregon -- Willamette River Valley5
- Botany -- Oregon4
- Coastal plants -- Oregon4
- Conifers -- Oregon -- Growth4
- Forage plants -- Varieties -- Oregon4
- Forest plants -- Oregon4
- Fungal diseases of plants -- Oregon4