Subject
- Christmas trees1
- Conifers1
- Corydalis -- Ecology1
- Douglas fir1
- Fir -- Growth1
- Forest ecology -- Oregon -- Crater Lake National Park1
- Forest ecology -- Oregon -- McKenzie River1
- Forests and forestry -- Oregon1
- Larches -- Alaska1
- Lichens -- Oregon1
- Lupines -- Oregon -- Crater Lake National Forest -- Ecology1
- Nitrogen -- Fixation1
- Pesticides -- Environmental aspects1
- Pine -- Ecology1
- Plant communities1
- Plant communities -- Oregon -- Crater Lake National Park1
- Plant-soil relationships1
- Plant-water relationships -- Oregon, Western1
- Plants -- Absorption of water1
- Port Orford cedar1