Subject
- Bryophytes -- Oregon1
- Dendrochronology -- Middle West1
- Forest biodiversity -- Oregon1
- Forest ecology -- Middle West1
- Hickories -- Middle West1
- Lichen communities -- Ecology -- Alaska -- Bering Land Bridge National Preserve1
- Lichen communities -- Effect of grazing on -- Alaska -- Bering Land Bridge National Preserve1
- Lichen communities -- Geographical distribution -- Climatic factors -- Alaska -- Bering Land Bridge National Preserve1
- Lichen communities -- Oregon1
- Lichens -- Ecology -- Alaska -- Bering Land Bridge National Preserve1
- Lichens -- Effect of forest management on -- Oregon1
- Lichens -- Effect of grazing on -- Alaska -- Bering Land Bridge National Preserve1
- Lichens -- Geographical distribution -- Climatic factors -- Alaska -- Bering Land Bridge National Preserve1
- Lichens -- Idaho1
- Lichens -- Oregon1
- Oak -- Middle West1
- Riparian forests -- Idaho1
- Steppe plants -- Oregon1