Subject
- Animal cages1
- Crayfish -- Effect of metals on -- Oregon -- Willamette River1
- Crayfish -- Toxicology -- Oregon -- Willamette River1
- Elephants -- Behavior1
- Elephants -- Housing -- Design and construction1
- Elephants -- Housing -- Environmental engineering1
- Fish as food -- Contamination -- Oregon -- Willamette River1
- Fishes -- Effect of metals on -- Oregon -- Willamette River1
- Metals -- Environmental aspects -- Oregon -- Willamette River1
- Water -- Pollution -- Oregon -- Willamette River1
- Willamette River (Or.)1