Subject
- Caspian tern -- Ecology -- Columbia River Estuary (Or. and Wash.)2
- Caspian tern -- Food -- Columbia River Estuary (Or. and Wash.)2
- Colonial birds -- Ecology -- Columbia River Estuary (Or. and Wash.)2
- Double-crested cormorant -- Ecology -- Columbia River Estuary (Or. and Wash.)2
- Double-crested cormorant -- Food -- Columbia River Estuary (Or. and Wash.)2
- Airplanes -- Noise -- Physiological effect1
- American marten -- California -- Tahoe National Forest -- Geographical distribution1
- American marten -- Effect of forest management on -- California -- Tahoe National Forest1
- American marten -- Habitat -- California -- Tahoe National Forest1
- Aplodontia -- Dispersal -- Oregon1
- Aplodontia -- Oregon -- Habitat1
- Bald eagle -- Ecology -- Oregon1
- Bald eagle -- Food -- Oregon1
- Bald eagle -- Oregon1
- Barred owl -- Ecology -- Oregon, Western1
- Barred owl -- Food -- Oregon, Western1
- Barred owl -- Habitat -- Oregon, Western1
- Barred owl -- Oregon, Western -- Reproduction1
- Big sagebrush -- Effect of fires on -- Sheldon National Wildlife Refuge (Nev. and Or.)1
- Biogeography -- Panama -- Gatun Lake1