Subject
- Wetland ecology -- Oregon -- Willamette River Valley2
- Amazon parrots -- Conservation -- Guatemala1
- Amazon parrots -- Guatemala -- Geographical distribution1
- Amazon parrots -- Migration -- Guatemala1
- Aquatic insects -- Coast Ranges1
- Aquatic insects -- Oregon1
- Birds -- Ecology -- Statistical methods1
- Birds -- Monitoring -- Statistical methods1
- Brown pelican -- Behavior -- Columbia River Estuary (Or. and Wash.)1
- Brown pelican -- Behavior -- Oregon -- Sand Island (Clatsop County)1
- Brown pelican -- Effect of human beings on -- Columbia River Estuary (Or. and Wash.)1
- Brown pelican -- Effect of human beings on -- Oregon -- Sand Island (Clatsop County)1
- Brown pelican -- Effect of stress on -- Columbia River Estuary (Or. and Wash.)1
- Brown pelican -- Effect of stress on -- Oregon -- Sand Island (Clatsop County)1
- Bullfrog -- Ecology -- Oregon -- Finley National Wildlife Refuge1
- Bullfrog -- Food -- Oregon -- Finley National Wildlife Refuge1
- Burrowing owl -- California, Southern -- Reproduction1
- Burrowing owl -- Dispersal -- California, Southern1
- Caddisflies -- Blue Mountains (Or. and Wash.) -- Geographical distribution1
- Caddisflies -- Ecology -- Oregon -- H.J. Andrews Experimental Forest1